Actually, here in the States the economy is starting to look up, so logically their sales would be marginally higher than expected. If their prices were lower, and they stopped hiking them up and lowering their store hours, odds are they'd sell more minis. Hell, if minis cost less I'd buy a hell of a lot more of them. Odds are, as a whole I'd probably end up spending even MORE money at GW than before :U
Edit: And if their stores were open longer, they'd probably sell more as well. Many of the players I know spend their time testing new models and whatnot in-store, and then chunking/buying new ones. Experimentation aside, just the general elongated exposure to the minis would produce a greater amount of sales.