people dont need stickers. people usually look at the back of the box for requirements for the game. and they usually go and buy recommended requirements pc for a game. As we know on the back of the box there is two requirements shown minimum and recommended. They should stick a third one performance requirement, that can run the game on high settings. As every time you buy a pc game from a shop witch most people do they ask you did you read a requirements on the back of the box will you pc run it.
So imagine someone buys crysis and the recommended requirements of the back of the box is: vista/ xp , processor:2.8ghz for xp ,3.2ghz for vista, hardrive:12 gb, video card: 256 mb.
so for example the guy goes in a shop or he might have machine :
AMD Dual Core 5600+ 2.80GHz , 2 gigs of ram , and 8600gt 256 mb and he thins hell yea i payed 1500£ for this pc it should handle any game and even crysis. so he goes back home installs the game and it a lag fest on high. eventually he does not know why is that and gets angry and just forgets pc gaming and goes to play xbox or ps3.