Hmmmm... sometimes there's no safe bankroll rule. You can bet up to 1k at Mansion on the casino games, it's crazy.
Anyways, I'm at Stars right now and I've cashed out a huge amount and only left $170 for poker, $130 is at Stars. I might move some money back to Mansion for strategy points but, yeah, I'd rather not. I used the pennies I had at Mansion to play a slot and won like $11 and made 4 strategy points playing heads-up, then plopped $10 on the wheel of death! So, yeah, no safe bankroll rule there. But for strategy points I'll find a solution that doesn't put me at any risk. Betfair looks good because you can exclude yourself from individual games, which is a nice feature.