At this point I am wondering how you came to know, that I do not keep sending nonnakip messages via nastyfans.org/post.

Do you have access to those messages? What exactly happens with those messages?
He's not going to do anything unless you file a scam accusation & flag against him. This is his project. He started it. Its not your fault that whoever he designated to be in charge of dispersing funds has ghosted their responsibilities. Its clearly a failure on his part not to resolve a long-standing issue. As a sign of good faith, he should have paid you the BTC you are owed out-of-pocket, since he himself is the purchaser of your seats. But he's clearly not going to do that.
https://bitcointalk.org/index.php?action=trust;addflag=18321I would go with the middle option when adding the flag. Feel free to DM me if you need any help.
Nobody should be spending 1 satoshi on this given the circumstances, and I think the public has a right to know why not.