Hmm, maybe I'm used to different games, but typically there are some nickel-and-dime type purchases with premium money that you can pretty much extract the full

Hmm, maybe I'm used to different games, but typically there are some nickel-and-dime type purchases with premium money that you can pretty much extract the full value from one way or another. Clash of Clans has a speed boost, World of Tanks has premium rounds and experience exchange fees, etc. They're perhaps not the reason you bought the premium currency, but they're worth enough that you'll spend them.