You should add a plug-in that allows us to do a coin flip command that makes us put up a x amount of money and 50% chance to double and 50% chance is vanishes. Could also make it so that we could post public coin flips so people can coin flip against each other.
I've seen this on other servers before. It is quite fun to watch and participate in however it can cause some pretty salty players. I would like to see it implemented.