You missed the point entirely; no, I don't know with certainty each person's motivation. I can know only that each person will seek to resolve his reality to match his motivation, and can only know that motivation by his actions taken in such resolution. That's entirely my point.
There may indeed be people who would rather clean a sewer than beta test video games (I would be extremely skeptical if you told me you'd honestly fall into that category); there are indeed people who value hard work, dirty work and the like. What you're missing is that those are still values they seek to manifest.
You say that you see people do good that makes no economic sense; this is senseless and shows that you only see exchanges of money as "economic sense"; the capitalist understands that any action taken to manifest your values is a profit. If you wish to lose money to feed the poor, for example, then by donating to charity (or paying extra in your taxes, if you prefer the violent and roundabout route to that end) you are still manifesting your values; you are profiting.
So changing my son's diaper, even though I was not paid money, was in fact economically sensible. I desired -- that is, preferred, placed value upon -- the hope that my son would be healthy and comfortable and took actions to ensure that. I was successful; I profited by an increase in my son's wellbeing.
If you see money as the only form of profit and economic sense, then it's no wonder you call it "crapitalism"; you misunderstand what the goal is and how it is achieved.