I think that restricting the content for which you have paid for only one server is a mistake, I understand that the 30 days cannot be had in other characters from other servers, but not even the pet is kept, which is totally absurd now which is purely aesthetic.
The game is free to play, so you have to value that a person supports your game monetarily. I think that putting a server restriction for cosmetics is something that exists simply to try to get more money, and I don’t think that’s the way you should treat your players, and even less to those who support your project.