patswin, regarding mg's french roulette (and casinoshare!) I think I can fill in the logic.
I also checked out casino share. Maxed out their deposit at $250, got a bonus to bring bank to $500. Played risky blackjack and got to a bank of $1000. $250 of that is still "sticky" so do I try to grind it out, or withdraw?
The "base" WR for casinoshare is 30x bonus. For playing non-american roulettes, this is doubled. In other words, $15,000. The house edge in french roulette if you place an even-money bet (black, odd, etc) is 1.35%. So, if you wager $15,000, your expected loss is $202.50. This is still less than the $250 sticky bonus that you could clear, so it's
barely a positive expected value to go ahead and grind it out.
However, variance can be a bitch. I set the autoplay to 9000 one-dollar spins (on black) and left the house today. When I got back, the 9000 spins had spun, and I had lost $432, and the entire bonus still hadn't been cleared yet.
I don't know if this is within the realm of mathematical expectation, of if microgaming's number generator got confused.
If you want to autoplay like a maniac, go to expert mode, set zero seconds between spins, turn on the turbospin option, and you'll probably want to turn sound off too.
I'm actually on spin 1400/5000 of my followup round while typing this.