I can't particularly relate, There are things that I am paid to do and there are things that I want to do...sometimes those two things overlap, sometimes they don't. Money is one way to maybe produce incentive..it's not guaranteed and it's not the only way.

I can say for sure that the quality of the things that I want to do will always have better quality on average than the things that I am paid to do.

I can certainly generalize that humans are not flexible, but I don't think that's limited to programmers.