I'm a tipper, but some of the places I'm asked to rip don't make sense. I just deleted a thread with a picture, because I noticed the place put their name in the tip section.
They make a great product, and I like them. But... tipping for an online purchase?! Nope. I can see why people have started refusing, and I don't agree with that. But I think this over saturation of ripping was intentional.
Skirting tax law only works for cash tips.