Right now, Brax is pretty easy to steal from. If you've got one of the few teleporting trees, you can easily rob him blind, hop to the floor's exit, and never worry about him or his collectors. And even if you don't, it's really not that hard to kill him. A decently specced warrior or wizard should be able to take him out by level 15 without any problems at all. Why are stolen items suddenly safe as soon as you reach a set of stairs? Why not keep spawning collectors for the rest of the game, necessitating you to be strong enough to beat them before you can steal anything?