This is some kind of money scam. Some users change their nicknames for free, while others have to pay 50 bitcoins? Are you seriously kidding?[/color]
Nobody has bought Donator or VIP memberships for the past 7 or so years. The last person to buy one was "Claymore" (and that was only because he struck gold with the Ethereum EthHash miners he developed.)
If we ignore him then the last donor/VIP was from even more years ago, as I doubt anybody was willing to spend 10-50 BTC on a membership in 2014-2016.