What I have in mind is similar to a game called Conquer. So for each esteemed contributor of the community who donates a lot of gigas to the server, they will be granted special ranks. The ranks would give the person a titled based on how much they donated.
For example the top three donators would be awarded the title of King or Queen, the next five Prince/Princesses, next 10 Barons and finally the rest would be Knights. (The names would be changed to match bots.)
Additionally, there should be a minimum donation amount. The people who have donated should also be entitled to something extra but it's more flashy than useful. It possibly could be the advantage of colored text, colored name or extra luck? Some other possibilites for the adage includes: Ranking Flags with regular stats but exclusive to each title, a modded Knight Merc just for show, or modded transes. Feel free to suggest benefits as these were the first things that came to mind.
Just some thoughts, this could help with the gigas inflation.