I guess I'm asking for trouble, but I love selling orchids... Perhaps it is my personality. When I instruct I instruct... In teacher voice, sometimes, if I need to. It sometimes even works. What I don't really like is keeping my web-inventory up to date. It is just the last thing in the world I want to do. But selling at shows or in the greenhouse is fun.
I have a few difficult customers, but they are usually my best customers so I tolerate it. I can't remember anybody doing something really stupid and then trying to blame it on me. Or perhaps they did, and I just didn't notice? That would be a hoot.
I have had a few people who have told me plants haven't done well, and I often just give them another one even if it was their fault. Or at least a nice discount on the next one. It doesn't happen very often. I think most people are embarrassed to complain. Maybe it is a midwest thing. Usually if I replace a plant it results in high satisfaction and many repeat orders, so it is a win-win.
I've had a few boxes not make it for various reasons, usually the post office's fault. I expect it to happen sometimes, and I suspect it happens more often than I hear about (again, not everybody complains).