Jeez... I've been hard on Goko, but I'm really not seeing $70-80 as a problematic price point, guys. Slightly steep perhaps, and the "Gokoins" thing is annoying, but it's not in the realm of ridiculous. Remember: That price is for seven games. Not one, seven. Ten bucks a game really isn't that terrible.
But it's not the price for seven games. You're paying for X combinations of kingdom cards for Dominion. I'm guessing for a lot of people, X will be sufficiently large after an expansion or two, and they'll occasionally play with other expansions when the host has them. This will lead to a pretty fractured player base, and I'm not convinced it will actually net Goko any more money than if they'd priced the expansions at half of what they are. But I've never been a VP of Monetization, so what do I know?
Even if it we did agree on your definition of games that price is still high. When I look through my purchase history of iOS boardgames, $80 actually gets you a lot more than seven games (and I should add, they are truly games that go anywhere).