I know seeing as I'm only a lowly player, I doubt that you will consider my suggestion. But Vendetta Online is really an awesome game, and I KNOW that if you change your business model to support a One-Time pay sort of program then you will get wayyyy more players. That, and working with some other game community client such as Steam, this game could really get bigger.
Feel free to shoot me down, just give me a reason plz :)

A pay one time fee would probably have to VERY expensive. Enough to pay for, possibly, years of use and server space by that one person.

Part of the appeal of VO is that all you have to do to get the money to play every month is go without pizza for a week.

You are only a lowly player if you say you are.

Steam has formally declined to include VO. No reason was provided.

One-time fee only works for Guild Wars because their hosting is very minimal. Instances aren't hosted on their servers, so they don't need the infrastructure that a game like VO, which is a persistent world, requires.