Well as a user of etn's mobile 'miner' app, the rewards are very small in increment and have been slowing down as value and difficulty flux. I started over the summer and etn paid about 3 per day' payout at 10. Personally as a user this is pretty cool from the hodl point of view, but probably isn't truly ideal. You are proposing 1 as a reward but you can go lower, probably down to 0.5. Start at 1 I guess but as more people join I would drop that down over time, or maybe involve the app in some form of off-chain verification like a mini z-snark or witness of sorts. Either way it looks doable as a faucet system.