I buy troops off the BM but it don't get added to my totals. My troop totals don't exceed 2,147,483,647 each no matter what I do. Mice, Squirrels, and Hares have all topped at this amount. Seems like it's just an exceeding max bug of some sort.
BTW this is in CTF, I don't think I'm good enough to get that much anywhere else
EDIT: I think above bug is due to the game not being able to count above 32 bit (2,147,483,648)
I know the voices in my head arn't real but they usually have some pretty good ideas.