Why Your Provider Wants To Be Tipped Before You Spray DNA
1. Every provider has been burned by a monger who said they'd tip $XXX then walked or ran out without paying.
2. Many many providers have been burned by mongers who leave a tip on their credit card then later dispute the charge. Card holders rarely lose disputes.
3. Every provider has been burned by a monger who says they will tip $XXX then gives her less than that and says something like, "No, we agreed on much less. ".
4. Your provider might be getting the vibe from YOU that you are one of the mongers in the list above.
That said, we've all had providers who negotiate for a number then don't honor the menu that was negotiated for. If, for example, you prepay a tip and don't get the menu you were told, demand your money back. Providers do not want a big scene or a hassle.