I feel as though no actual thought was used when the OP was typing out their initial post...Even a child can give a basic answer: "It's the system I play on currently."

If we're in the mood for stupid questions along these lines:

"PS3 was bound to come out sooner or later. Why did so many people bother buying PS2's?"
"Why play Dynasty Warriors 5 when Dynasty Warriors 6 is eventually going to come out?"
"Why eat now if you're gonna be hungry later?"