It is a common feature in almost dice sites and it is attractive enough for some players. But in my opinion it is not effective enough, mostly leveling up faucet need to wager some amount of btc which is usually only whales will able to get bigger faucet amount. How about players with lower bankroll?
If you want to implement it, I hope there will be some ways to level up our faucet (not only by wagering) Maybe by being active in chat (if any), by referring active players, and some other ways. Just my 2 cents