I know they are being worked on, but I figured I'd throw out some ideas for benefits.
Back before fretta and TTT existed, Pulsar Effect, a community I was a member of, hosted a gamemode called "Murder" which was pretty much TTT as it stands today. You were all assigned either Innocent or Murderer at the start of the round and the murderer would have to kill all the innocents etc. Anyway, VIP Benefits from that helped bring it alot of donators for the community.
1. Higher chance of being traitor, not some insanely high "Always guarenteed!" chance, but something like non-donors have a 15% chance of becoming a traitor, donors get 30%.
2. Blue name in the text box, a small, easily implimented feature I'd imagine, also make admins more regonizable with a glowing or flashing name perhaps?
3. Higher paycheques in DarkRP, say around 20 or 25%.
4. VIP Section on the forums, just for random crap like "Post funny pictures" bla bla bla threads.
I'd help code these features but unfortunately my knowledge of lua is nil. I'm considering learning basic lua coding soon though, and DarkRP is easily moddable if I remember correctly, I managed to get a few custom jobs and stuff on my old DarkRP Server with no knowledge a few years back.