I found a website in one country, don't want to name it. It is well designed and sells a lot of airports and other complex aircrafts. They have my airport without my permission.
There are different kind of pirates. They can make money as well.
Three days after the first e-mail asking for refund, I asked him to feedback what is not good and screenshots, no e-mail back at all.
I agree with the rational refund request, no doubt about that.
BUT, please remind that not everyone is as good as you are. Cheaters are everywhere. Something wrong with these people, they will be very please if they get something without paying.