Paladin2905 said:
It gets hyped up, and it becomes a must-have item.
Personally I usually follow the late buyer approach, when my pc can actually play the older games at high speed and the modding community and developers have ironed out most of the bugs- but many people I know are buying the game at first chance.
I figure people just build it up in their mind, it becomes an impulse buy for them; even if they don't see it that way.
That right there is the most rational response; at least for PC or any other inherently unstable (non-native) systems.
1) You give the game developer time to iron out crippling bugs, and patch the game
2) You let the price come down a bit
3) You will have word-of-mouth and peer-review available to you
Of course, the poetic irony in this is that none of that would work unless there were already legions of fans waiting to buy it on launch (the initial price wouldn't go down, nobody could review it since nobody bought it, and ,love it or hate it, bugs are most quickly reported and resolved by those playing the game).
So despite how persistently obnoxious they can become, remember to thank the fanboys every once in a while.
...Quietly of course.