Donate $5 (US) and you get the rank "Donator". You can fly in any world and access special commands.
Donate $15 and you get the rank "+Donator". You can fly in anyworld, creative in survival, and access special commands.
Donate $30 and you get the rank "MegaDonator." You can fly in anyworld, creative in anyworld, and access TONS of commands.
Donate $50+ and you get the rank "HolyDonator" You might as well be a admin with all the stuff you can access!