I apologize, I'll respond to the full comment.
That's not how it works at all, professionalism is not tied to wealth. Those with more money are perfectly capable of being polite, and poor people are equally capable of being overly demanding. And no client, regardless of their wealth, will ever just throw around extra money because they're feeling happy.
If a client sabotages the work OP was hired to do, that could easily open the way for a dispute on the grounds that the work wasn't fully completed.
Ahhh ok, yea I agree. But you can also look at it as people with money want perfection and nothing is perfection. They will be stingy and treat you like crap because they work hard for money. (Not all, but some of the people i have dealt with in the past act this way). I agree though, not everyone is like this. I was just mentioning my personal experience.