Plugin to track user earnings

Hopefully someone can help me. I am creating a site where users will be able to register to the site and track their competition earnings. I am unable to find a plugin to do so. Basically i would like the user to be able to come to the site, track what events they have been to and track their competition earnings. Upon approval of their earnings, the earnings get posted to their user page to where they can track their stats. Any ideas on a plugin that would fit the bill?