Eechh...I would hate to play a game like this. It's not just the money factor, but the feeling that I'm being extorted, and that paying is the only way to succeed in the "life" inside this gameworld. This kind of decision would immediately make me ask existential questions like, "Why do I care so much about my status in this virtual world?" and then quit playing.
Then again, I'm someone who is a complete sucker for "Show your appreciation by tipping the creator" type of pitches, maybe even giving more than I would pay for the game's upfront price (in terms of dollars, for mobile games). There's the "reward" of "I'm being such a good gamer, recognizing the hard work of this developer"