Why do some people think 360 will outsell PS3?

[roadkillers]

Some people still do and I cant believe it. I mean the PS3 outsold the 360 in 2007 when the PS3 barley had any great selling exclusive games. Not just that but the biggest game the 360 will ever have (in my opinion unless 4 comes) in terms of sales, Halo 3, the PS3 still outsold the 360. So tell me why do people still think the 360 will "dominate" the PS3 in sales.

 I was just on another game website and he kept telling me that the 360 will kill the PS3 in overall sales. It got kind of annoying so im just woundering.