bler144: I tried to stick to one philosophy about which site to use, but realistically I end up bouncing back and forth between GoG and "that other place" depending on what my hankering is and what's available.
Humble only occasionally has stuff I want badly enough to buy there - the bundles would be more useful if I had a broader network of gaming friends to exchange games with.
Dalthnock: You gotta be realistic. Steam isn't going anywhere & if there's a game you really want that you're unlikely to get here, I say buy it. I'll fight for good causes, but not to the point of madness and/or stupidity.
Besides, where else are you going to get Valve's catalog? When they have a sale on it, Portals 1 & 2 are worth the price they ask for everything they ever released.
Some people hold their ideology as prime importance to them. Nothing wrong with that, although I've learned over time personally that ideology can end up being a self defeating thing when taken to extremes. I used to be a very strong Linux/OSS ideologist to a point that was unbalanced and self defeating. Over many years I slowly eased up and now I'm still a Linux/OSS ideologist but a much more balanced one that can see, understand and put value on some of the proprietary solutions out there also. Now I am more likely to consider my options and balance the pros and cons of each and try to be unbiased and choose what I personally perceive to be the best solution for the specific job at hand given my own variables and things that are important to me. Sometimes that means I choose Linux, and other times I choose Windows and I accept that they really do each have their strengths and weaknesses. Much like Bruce Lee learned to value all of the martial arts and integrate the good things from each into his own style instead of just being a Wing Chun master. Likewise, I value DRM-free highly in a similar way that I value open source licensed software, and I value GOG as the best store to provide that, but I also find value in the conveniences that the Steam store, client and services provide and am willing to use it where the specific product offering meets my needs outright or with minor compromise. For example, I will compromise on some things that use just the CEG DRM, but I will not compromise on things that use 3rd party DRM or require Origin or Uplay or TAGES and their ilk. I have a line in the sand that I draw, and it extends past GOG to the outer reaches of Steam, but there are limits to what I will accept there.
I have to agree with you on Valve's catalogue. Excellent games, and you can get the entire Valve catalogue for $20 USD during GreenManGaming 75% off sales where the Valve Pack is on sale for 75% off, plus a 20% off GMG coupon. That's about a bazillion Valve games for $20. Even if those games were to come to GOG, there is no way in hell that we'd ever see them go on promo sale as a bundle for $20 in the next 10 years. :) By the time Valve puts their games on GOG, I'll have finished them all and played them to death to the point I wont even care if I lose them from a future Steam insolvency. :)