Interesting ideea
The bad part is the users want to get some Satoshis every time they hit the claim button.
I think many users will abandon if they do not win anything at the first draw.
Yeah, but those who stick around can get really nice daily reward, much better than on most of ordinary faucets.
Like I said, it's possible to modify the plugin, so you can sell lottery tickets, make variable prizes based on number of sold tickets etc.
If you have ordinary faucet and spend 5000 sat/user/day, and you have 1000 users, that's quite a lot. But with lottery, one user can win let's say 100 of 5000 Satoshi prizes, if you can afford it
Besides, you can organize weekly draws with larger prize fund and big numner of winning tickets... etc. etc. It's flexible...