The maximum it would take to absolutely guarantee a 100MM market cap would be $100,000,000 but would almost certainly be a fraction of that. Throw in a plunge protection team to smooth out the most extreme volatility and you'd have a coin anyone and everyone would want to buy or mine.
Ah come on, you. must. be. joking.
He doesn't even know someone tried that already. Paycoin was it called?