Unpopular opinion: I don't tip when I lose, which is most of the time. When I win, I'll tip 1-2% max. The casino already has a massive edge on every game. Why should I give up more of my money?
Roobet's European roulette is decent but their table limits are too low for my taste. Max bet of $1k isn't enough when you're on a heater. Stake.com has $5k limits which is much better for serious sessions