Gundato: As for the lowered price a few months down the line (unless it is Call of Duty...): One could argue that all costs have been made back by then, so it is just a matter of funding future projects. Probably not the case, but it is something to consider.
DarrkPhoenix: I'd be pretty shocked if any company was doing this, considering they'd basically be saying "You know, we've made enough money off of this product, let's change the pricing on it with the express purpose of making
less money." While changes in marginal costs can have effects on optimal pricing, fixed costs have no bearing on the matter. Now, an interesting exercise to do with respect to the changes in pricing I mentioned is to pick out 5-10 games that have been out for 3-9 months, choosing them to cover a bit of a range in quality and the reception they received. Then check the prices the games are currently being sold at at places like Amazon and see if any trends jump out at you.
Gundato: And you mention that the higher price can cost sales in the long run: It can also increase profits.
Yes, it can, but as you said it's a careful balancing act. However, we actually don't see many companies trying to do any balancing when it comes to game prices, but rather just going with a default $50 price tag, which kind of goes back to cogadh's original point.
Well, there are also actually some good reasons to keep at the 50 dollar mark.
Between KOTOR 1 and KOTOR 2, there were almost no real engine improvements. Obsidian mostly just tweaked a few things and made a new campaign. As such, if we price based on content, there is much less incentive to do sequels. Sure expansion packs and DLC are options, but sometimes you have too much for an expansion, but still not a full blown new everything.
By that same token, it might take 9x as much time and work for Dev Team A to make "incredibly convoluted, yet entertaining, 4x game" while it might take a lot less time for Dev Team B to make Modern Warfare 3. The thing is, if those each have different costs and "worth" and the like.
And, of course, the simplest case of all: Let's say STALKER 2 is sold for 30 bucks, and Crysis 2 is sold for 40 bucks. People are going to inherently think that Crysis 2 is "better" because it is "worth more". It is the same reason that so many people bash budget releases and the like. I honestly suspect that might be one of the reasons why almost nobody has heard of UFO: ET, but UFO:Aftermath got somewhat well-known. ET retailed at 30 bucks, new.