People are so used to being lied to that they get angry when you tell them the truth instead, even though they already knew the truth.
I’m half joking, though. Part of what makes society work is all the things we do to put a nice facade on things that are ugly. If we all went around telling the hard truth all the time, everyone would be angry at everyone.
All that said… Basically saying “I underpriced the product of my hard work and I’m correcting that” shouldn’t be that shocking. Especially when tempered with “Go pirate it if you want”.