Well, you tried going about it the right way. Some people are weird like that. Now on your days off, if you worked construction or whatever, would they want 80% of that pay too? It's all BS, and Aviation departments are weird about it. My current employer was going to do that if I did some part-time work for my old charter outfit, he was going to charge them a day-rate. So I never did it. Although I would've done some weekend flights for them off the books, but it never did work out while I was current. I can't complain, I'm paid well to sit at my desk most days.