How come most racing games now are one player who really wantes to race the computer?

i want a two player nascar game cause that would be freakin sick better than this one player crap

GTA 4 – 7 Player Online Police Car Racing

This is one of many races that can be done on GTA4, this one happens to be a police race with 7 players online over xbox 360 live and optioned with alot of traffic and lots of fog….. hope you like it….