Well, the pleasure center and the reward center are different things, but I take your meaning. I think that I could be conditioned to build a baby-mulching machine or a doomsday device. Why not? Other people have done it. Why would I assume that I'm that different from them?
EDIT TO ADD: Even if I have a value that I can't escape currently (like not killing people), that's not to say that if I had the ability to physically modify the parts of my brain that held my values I wouldn't do it for some reason.
I think that I could be conditioned
My statement is stronger. If in your current state you don't have any terminal moral values, then in your current state you would voluntarily accept to operate baby-mulching machines in exchange for the right amount of neural stimulation.
Now, I don't happen to think this is true (because some "moral values" are biologically hardwired into humans), but this is a consequence of your position.
Part 1 was previously posted and it seemed that people likd it, so I figured that I should post part 2 - http://waitbutwhy.com/2015/01/artificial-intelligence-revolution-2.html