MyBB Community Forums

Hey I use new points on my forum and I had an idea. As an add on to new points there could be something were members can say I'll sell 1000 forum credits for 5$, and another could say I want to buy 5000 forum credits for 10$ and then x% of the money is given to the seller and x% goes to the forum?

Your luck with Newpoints stuff may be greater here:
http://forums.mybb-plugins.com/