For everyone complaining about the price, there really is a very simple solution :
DON'T BUY IT.
Now, try to follow. See, if you don't like something about a product or what it costs, the generally accepted rule of thumb is to realize that you aren't owed the product, and just move on and not purchase it. Amazing! Now you haven't bought the product you have a problem with...no hassle, no problems!
It's so SIMPLE! :)

There's really a simple solution to your problem: Do the same thing you advise. Ignore the issue and move on. ...or we could do what you just did, and confront the issue in hopes of improving the situation in the future. Constructive criticism is healthy for business. A business that doesn't want to know what their customers want, is a failing business, and the great people working at GOG aren't anything close to fail.

Is some of it constructive? Of course. And of course that's a good thing for any company to get. However, the spiel of "I want it cheaper!" posts just come off as gamers with an entitlement complex.
Beyond that, since it's the game publishers who set the prices GOG will use, it isn't actually GOG that these complaints should really be going to. Sure, they're receptive...but they can't really do anything with them. You want changes? Complain to the publisher over the price point they chose. THAT would be truly constructive criticism.

Actually some of us have been trying to point out the need for new price points to allow for cases like this where is obvious that the companies are willing to allow DRM free versions and sell them at different price points than GOG makes available

Well, pointing out that you get the whole pack on Steam for 9,99 bucks and thus knowing the price difference of 10 bucks (meaning a whole $9,99 or 2 5,99 GoGs) is not really appealing does make it constructive.
Sure, we got support here. Sure, we get it DRM free.
But is it really 10 bucks more worth it if you get it somewhere cheaper?
I wouldn't mind to give it to GoG, the whole opposite. But this is giving me a light negative manipulation from Activision's side IMO. The Europeans get the pack for the half at Steam, why buy it here then?
It seems like to me whoever forced this up want to bring us to rather switch to Steam rather than here. And pointing this worry out is making it constructive aswell. Because we are all cheap pricks.

I don't know about anyone else, but I certainly like to do that. Of course it's not impossible for the publishers to browse here as well. That and GOG, having read such comments here, may also make mention of our preferences to publishers during future price setting negotiations. Your point is a good one, but it's still somewhat helpful posting here.
The hardworking folks at GOG seem very keen on setting some new price points in the future. I believe they said something about becoming more established first. I think this will go a long way to giving GOG, the publishers and the customers closer to a better compromise in price.

That could be the case. I would assume Activision and other big publishers would like people if they are going to have one DD service they'd go for the one that has the DRM strings and sells their big titles too.

So to get back on topic, and in a more positive light... Which of these Space Quest titles do you like best? (or for that matter, which of any SQ titles do you like best?)
Out of this bunch, I'd have to go with what is likely the popular choice and choose Space Quest III: The Pirates of Pestulon. The parser was better, the 16 color graphics were highly improved over the last games, it added sound card/device support, and there were some fun minigames to boot.
Out of the entire series? That's a bit tougher. Probably Space Quest IV, but I really enjoyed V as well. (Even without Scott Murphy.)

It's worth mentioning that many people (myself included) assert that they will pay more for DRM-free games, and I'd venture to say that that is true of a good chunk of GOG's user base. It would not surprise me if publishers recognize that fact, and attempt to use it as leverage for higher prices in certain cases, at least on an experimental basis.
I don't say that to be all GRR EVIL PUBLISHER - if they recognize that GOG's stance on DRM is a selling point for some people, more power to them. I'm also not saying that this necessarily happened with Space Quest or any other release. I'm just saying that if we see things priced a bit higher on GOG than elsewhere (especially as time goes on and GOG becomes more established), we shouldn't be surprised, or even upset.
That said - in my region, at least, both Steam and Direct2Drive list the complete Space Quest collection at $19.99.

These games aren't really on my list right now, but GOG, just list for a fair price, I'll keep buying stuff!
DRM free and making a statement are worth it to me and fits in my budget. I understand some folks may not be able to afford the extra cash, so I can't tell them what to do, they should do what they feel is best.
If you can afford the price difference, of course you should buy on GOG!

Hurray, but I'll wait for a sale. I'm in no rush to play these games, especially at the same price of retail and half the number of games...

I really wish GOG would sell game packs like Steam does. If they could do something like $15 for both Space Quest packs then that would be great. I know they've talked about doing more price points (probably $3 and $15?) and I think it's a good idea.

Vivendi reprinted the last Sierra SQ bundle (I-VI) including DOSBOX and setup instructions, and that edition is still in print. It can be found at various reputable online stores for as low as $12.99 shipped. CD media, no DRM. For this reason alone, $20 for the set on here or on Steam is a bit overpriced. I am glad to see GOG doing what it's doing, and will personally be buying a couple of things here shortly... but for this particular product, it doesn't make sense. I would have expected SQ I-III to come in at no more than $5.99; the first three games are all fun to play, but they are shorter overall, with less complex puzzles to solve, and less sophisticated graphics and audio.
Now if GOG wants to make some serious $, they should persuade Activision to let them re-release the complete Masterpieces of Infocom as a bundle.

Go to sierrahelp.com. There are installers there that will give you the install.exe and move it from the steam directory so you don't need steam to run them anymore. Beyond that, there is a version of install.exe somewhere out there (can't remember where I picked it up) that can be used with any of the SCI Sierra games.