This was a few years ago, when I didn’t charge what my art is actually worth.
I had just finished a commission and only wanted five bucks for it. The client actually sent over twenty-five bucks. When I went to thank them, this exchange happened:
Me: Holy moly, that’s really generous! Thank you so much!
Them: No problem. I think your art is worth it. But don’t raise your rates to that; I enjoy making people thank me and you wouldn’t do that if I just paid your rate.