It's your money that you are putting into the game, the decision is yours whether you actually buy it. I myself only buy ranks if i have money spare that i don't have a use for, otherwise i'm not going to put money in this game.
Add a pearl cooldown.
People are able to spam pearls to get out of combat, i would suggest adding a 12 second cooldown to pearling.
Ruins pvp on skyblock since everyone is able to get away.