I like it, it's actually got me excited to play again.
As for "Buy more, win more"
There are 2 stops against that, one official and one unofficial.
Official: If your opponent outnumbers you by more than 30% you can choose a Sudden Death goal. They include such things as: Killing a specific unit, holding an objective after a certain number of turns, having a unit survive a certain number of turns, and a few others besides.
Unofficial: "You brought one unit of 500 orcs/stormguard/elvseses? Maybe go fuck yourself. Anyone else that's not a knob want to play?"