...despite ppl p2winning about 3k-5k euros for sure on that single server.
If this assumption of yours were actually true, people spending thousands on pirate servers with game patches before 2015, then for some years by now you would have an official Classic server at least for EU people. Truth to be know is, there is none and this pretty much is because "revenew" factors.
I cant speak for people who I dont know, its easy to say "there are lots of people who spent thousands on pirate servers" however I dont see anyone saying "I spent thousands on them" and of course with means to prove it.
At least I have my Steam Wallet, PayPal and Bank history that can back me up if I ever need to speak like that but I never seen anyone who can back up that here.
You people need to put your feet on the ground and understand that if "TERA" pirate servers are in even worse state than Killian were a couple of years ago and if temp event classic servers have no success then there is nothing to back up the thought that a Permanent Classic Server would be a success.
If anything I convinced that the suggestion should be to get a temp event server for Classic version and ask GF to extend the live time as long as they can and not only for one month. You cant bit more than you can chew.