You sure like quoting me don't ya Charles? In all my years of tending bar and waitressing I have encountered just the opposite. I tip 30 percent min. when I go to a restaurant and at least 10 per 3 drinks at a bar...of course if you are a woman who has never had to depend on tips, you probably don't tip very well. My best tip by far as an escort was from a woman and it was a grand. Most women tip male strippers much better than guys tipping the female version....that's a fact!
It was not until I learned what it was like to depend on them, that I changed my way of thinking and started tipping more. The girl at Sonic now gets at least 5 bucks even if all I order is a 2 dollar slushie.
As for the hobby, I set my rates to include a tip....anything above that I prefer you write a check to a charity on my page. I don't expect anything, but let me tell you how nice it is to see an extra $50 or $100 in that envelope when you are NOT thinking it's going to be there.
As for discounts...only for Military and guys driving more than an hour to see me, and that's never off my min. I normally offer the 90 min. rate for the hourly, but don't ever mess with my bottom line.