Thieves are amazing at cabal fights. Grenades/emetic will stop most raids flat out, not to mention traps and pepper dust. Parting block stops people from escaping, scrolls can blast the room with some pretty devastating effects.

And it's not 12 points, it's 34 points to get to this. If you want to land poisons with hypnotize (yeah because lowering con for 2-3 rounds by 2 points is HUGE! *sarcasm*), you've already spent 64 points to finish being a poisoner. You've got a whopping 2 points left. No cheap shot, no adv. pick lock so you can actually afford poisons (which will sink your money faster than anything), no gentlewalk to get around...

Prove me wrong though. Make that badass hypnotizer and show the world how wrong I am. They've been in for years and hasn't been one yet.