Yep,
aka has a good point, while French Roulette can be "theoretically" profititable (with 50% or more weighting), the risk can be pretty darn large, even with thousands of spins at only $1 bets. (unless you bet on both black and red, which might get you thrown out).
I've gone through two different ways of thinking about this, personally:
1) When risk averse, I've just gone ahead and cashed out. I especially got like this after I had a bad roulette streak and lost about $500 after many thousands of spins. Also, autoplaying thousands of spins is simply a pain in the butt. Withdrawing immediately is quick and easy and painless.
2) On the other hand, playing all that roulette with inflate your playthrough numbers with the casino. That might earn you some comp points, or, at the least, make you look like less of a bonus-hustler.
I've grown less risk-averse as my hustling bankroll grows, so I generally go with option 2 now (as long as french roulette is weighted 50% or more)