Point costs and balance

[Marcello]

Why there are almost no anti tank guns sold in 2011, i'm pretty sure that some armies do have them in real life that cannot buy them in winspmbt ?

Russia does still have them in the game, as well as several of its former clients.
As for everybody else, they mostly gave up on that item as soon as recoiless guns and ATGM became available. They simply have too many drawbacks for most applications. The soviets on the other hand thought there still was a,small to be sure, niche for them in their doctrine so they kept building them.

Any one of you there hav good use for those expensive IFV's ?

If you are going against talibans a Puma looks more attractive than a late model Leopard: cheaper, more HE rounds, internal infantry squad, armor still good enough against basic RPG and the same useful perks of the modern MBTs (high FC, TI)...