Looks fine to me.
If this method of earning beyond 7 days becomes popular, perhaps people will hear about it, and return. Especially encouraged to return if signs of activity help one qualify for a chance at those added rewards.
I agree with another commentator here recommending something like this system come standard with frontends. There's a shortage of actual paying consumers but providing them with more variety of products (content) to support could help encourage them to show up as well, if everything is straightforward and easy to accomplish.
We'll see.
Thanks for your time.