I'm sorry to be so rude, but this has to be the most selfish thing I have ever read. Instead of being grateful that people are donating so that you can play for free, you don't want people to donate?
Last I checked, servers cost money to run. Who's paying for these servers if not the donators? I assure you, contrary to what you think, money does not grow on trees.
More donations = more funding = (possibly) more developers.
As such, you should be advocating people to donate, not crying about how there's some unfair advantage (which fyi, doesn't exist, all the gear donors can get is obtainable in game for free as well).
You never got to play on private servers of old, where donators got donator only items and could solo 10-20 players alone...