That depends Smokey, I would have enough money to have both except I have to pay a mortgage, go on holiday, maintain a decent car and socialise which sadly cuts in. I'm not saying you don't have those things but I simply can't justify spending money on both systems on a regular basis.
Don't worry I am keeping the PC for internet useage and photo editing and resignation letters (coming soon to a business near you!), stuff like that.
And when you talk to people its amazing how many have Xbox 360 and the online service looks great and so easy.