/shrug If I was simply into a pain / pleasure model I'd be playing wow for the rest of my life or jumping from mmo to mmo. As it is life doesn't really make a difference to me whether it is pain or pleasure. My motivations for actions go far beyond something that simple to the point where if you told me the rest of my life would be nothing but pain by continuing down this path I would still choose to do it.
My problem with the pain / pleasure model is that it does not add in the element of conscious choice and free will. I might agree that the vast majority of unconscious (not awakened) people follow this model but even then I'm not entirely sure.
For example why would a father save his child from a burning building and die for his child? Why do people sacrifice their lives for others? Why do people join the military if they know they are going to go to war?
The model is too simplistic and doesn't encompass enough for me to consider it an accurate model of human beings.