[Batman]

There isn't really much to stop this happening in a regular game when one player is

a) rich
b) successfully able to remain neutral.

It would be like being Switzerland! You'd also need to be trustworthy (i.e. people have to believe that you're going to give resources back to them if they bank with you)

In all likelihood, the temptation to take the money and run would prove quite great. (Especially if other players have a lot invested in you, then they might protect you to protect their money)