OP, you leave out too many details. For shaaaame.
Last gen, PS2 was the easy console that got all the games, while Xbox was the large system with more maintenance, but more features. Now, PS3 is the large, high maintenance model with -less- features (at least when it comes to online play) compared to the Xbox 360, which is now the more casual gaming console of the two.
Also, if you didn't understand what I meant by high maintenance for PS3, the cell processor is holding the PS3 back. It's easy to program for the Xbox 360, because it's more like a PC. The PS3 is a bitch in a hat to program for. Most games on both console end up better on the Xbox 360 than on the PS3, a good example being Fallout 3. Fallout 3 was a festering pile on PS3, and it looked quite good on Xbox 360, and looked epic on my PC, because that's not really a console game at all to me.
Let's not forget that Xbox 360 likes to get its own exclusive content, no matter the means. Such as, The Lost and The Damned for GTAIV.
So, honestly. Why pay extra money for the PS3, when its online interaction (not the people, I mean the actual functions) is shoddy at best, is much more difficult to program for and ultimately gives any cross console game a problem, and doesn't even have as much content? Because people thought the PS3 would be like the PS2? 'Cause of Home, that God awful atrocity? (At least Miis and Xiis don't run after e-babes constantly.)
I'll tell you why! Because some people who are actually gamers, instead of fanboys, like themselves some Metal Gear Solid 4, Flower, flOw, Motorstorm 1/2, Wipeout HD... But those are aboud the only notable exclusives. When there're ten exclusives, at least, then the PS3 will have a real fighting chance against Xbox 360.
But Wii still wins in sales. By far.