Just out of curiosity,
if you use your free rolls for lottery tickets, is it possible to win anything in the lottery?
I've tried sometime ago the free rolls every hour and I got some satoshi which I exchanged for lottery tickets, of course they were like 100 or 200 tickets, almost impossible to win, but still a fun to play.
Have a look back through the lottery results history and you'll find someone once won a prize with only 2 tickets. That's the thing about probabilities, no matter how improbable something may be, it can still happen.