[Tee]

For Deathmatch servers:

More money from a kill.
More score from a kill.
Free armour on every spawn.
Extra guns.
Donator 3DText as cj101 said.
Spawn vehicles.
Tune vehicles

For Roleplay:

Maybe extra cash.
Their own org/faction.
A house of their choice.
A business of their choice.
Spawn vehicles.
Tune vehicles.