Hmm i remembered at ep 13, when u win with the last digit at the loto of onyx arcade, u were awarded with an ultra ball, but now at ep 14, u win just a full restore
The max revive isn't really op because you can buy Cotton Candy at the Agate Circus and it has the same feature (although I think Ame's going to nerf it in the next episode).
I know, it's more because I always win due to the Member Trading thing. I tend to sell the the revives and restores for a good profit. No clue what I'll buy, though.