Let me make another observation about "cross platform" play and Consoles vs Computers:
Ive played World of Tanks both on PC (up to Tier 10) and on Xbox 360 edition (up to about tier 6).
The way that people pay is vastly different. Stupid stuff that people do on PC's at Tier 1, and learn "what not to do" by tier 4, they are still doing at Tier 6 on the Xbox. (e.g. drive across an open field with no cover, stand out in the open wondering why they are getting shot-up, etc).
I don't know if its just that game, but It is like the worst possible players are doing the same stupid moves on Xbox even at the higher levels. not that stupid moves don't occur on the PC game also, but the play style just seems more "goof off" on the Xbox server.
Probably younger player base. You also get your fair share of numptys on PC games too. Look at this game. Its not a numpty free environment.
Consoles cant really cheat either so at least theres they would reduce the cheater ratio if a few million joined up.