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As a monkey fan I must say that this is just wrong on so many levels.....yet I intend to pose the idea to my DM as I must have a suicid...I mean a nice happy monkey doing thing for my evil PC...hehe....all I can say is BOOM
The sadistic trap thing is cool, but you can always use it as a cheap animal companion. Of course, they might not be as obedient as a magically bonded creature, but once you spank him a couple of times, he'll behave.
ANd then you can train it, give it a wrench, and use it to sabotage enemies.
I'd give it the same cost, with a 1% chance per use of getting the Avenging Monkey:
Base 4hd Awakened Dire Monkey (Medium), Half-Fiend Monk 5/Sorcerer6 (Fireballs!)
I assume you have some way to communicate with the monkeys to tell them to do all these things with levers, etc? Otherwise I believe all they can/will do is attack your enemies, just like a summon spell.