There are really only two things I can say to this post.
The first thing is the same thing I'd say to anyone who justifies not tipping their waitress by saying the prices are too high and that they're unskilled laborers: "If you can't afford to tip, you can't afford to eat out." Seriously, if you can't afford to tip your dealer, then you can't afford to play poker for a living.
The second thing is that if you honestly believe that poker dealers are unskilled laborers who should feel lucky to make minimum wage, then it's clear that you've never learned how to deal poker nor have you dealt a live game. I implore you to spend some time in the box dealing to a group of strangers to get a better idea of what it entails. Don't bother learning how to deal first since you clearly already know, just dive into it. I'm sure you'll do fine.
And to answer your question, I'm by no means a generous tipper. I tip $1 if I'm picking up more than the blinds (depending on the rake). If the rake is too high, I won't tip until the pot reaches a certain amount, unless the dealer sucks or has a bad attitude. They get stiffed. When the pot gets over $100 I might tip more based on pot size and how much I like the dealer, but no more than $5. It doesn't matter if we get to showdown or not.