I see fiverr as a community of freelancers. the creators set thier own rates. they work out the deal with the client.
From my end i see a business transaction. If i hire you to do something, then we agreed to the terms of the gig. I find it super off putting to see a “tip me” box at the end of the deal. We had a deal. We both lived up to our ends of the bargain. I’m not asking for a small refund for being such a good client.
Am i a jerk for wanting to keep the money used in a transaction at the amount agreed upon?