make the sale at your detriment
I like that phrasing.
Yeah, a was speaking and (slightly) thinking about people with the pure motive to harm, which wouldn't be a typical case of this. Refrase with, "Don't blah blah blah if you will end up making explicit negative judgments at them," and you have a better version of my thought.
In light of reading through Raemon's shortform feed, I'm making my own. Here will be smaller ideas that are on my mind.