After collecting the money from the customer, I'm going to put the money in my pocket.
You know that is stealing right?
I've tapped into the customer's guilt trip, making them think they owe me for something great I did for them.
Your manipulating them through guilt to make them think they own you? That is immoral and unacceptable.
It's because I didn't win in life.
Who cares about winning, stealing peoples money is plain wrong. If you do a good job and they want to tip you let them but you can't demand more under false pretenses.