Because the PS2 has some big well knowen games, GT3, MGS2, GTA3, FFX, just to name a few, and also i think that if you was to ask joe-public what the Xbox was they wouldn\'t be able to tell you, i am interested to see what the sales are like in a year of the ps2 and the Xbox and even the GC, i think they will even out abit more, you have just got to give the other consoles the time the ps2 has had.
Also what sony was cleaver in doing was that everyone knew the name playstation, so as soon as you say Playstation2 you are going to know what it is, but where nintendo had the N64 they have know got to market a new named console, which takes time.