I have to agree with Hulihzack - BRBs are not inherently more "nippy" than other snakes in my experience. My brother has a pair of them, and I've never even seen them get twitchy, let alone actually take a swing at anyone. Heck, even the juveniles I've handled have been fairly calm, though they do tend to be more defensive than adults. I think a lot of bites from "nervous" snakes are actually due to nervous handlers, to be honest - if you're nervous and unsteady, the snake picks up on it and becomes nervous itself.

Also, as others have stated, they're just amazingly beautiful, and of course the cost to feed them will be considerably less than a BCI.