Bit City is made by NimbleBit, so anyone familiar with their typical game design should know what they are getting in to. I generally despise free to play garbage, but I have been a NimbleBit fan since I first bought an iPhone and spent way too much time breeding as many frogs I could in Pocket Frogs.
Tiny Tower, Tiny Planes, and Tiny Trains are all pretty generous with currency, and I've never had a problem waiting for things to finish building. I don't know why I give them a pass as opposed to other freemium developers, but I think NimbleBit does it right.
Except for the removal of Tiny Death Star. It is a shame that that was removed from the store.