Haven't had time to write this myself, and would need to dig out data-sources to make it work, but I'd like to see my expected value divided by planning time for joining a given OC. Specifically: I want to know if I should join a level 7 OC that will complete in X days, or a level 8 OC that will complete in Y days.
You'd need to calculate expected payout for each OC, inc those that have eventual payouts (generate another OC) or are based on market-prices of rewards. If you wanted to get really snazzy you could also incorporate the strength of each current participant in determining payout rates (even as an estimate).