You are more than welcome to the feedback.
The other contest was based on parlays as I remember it.
If you had a contest that took into account all bets, i.e. Singles. doubles, trebles etc. and based it on highest profit percentage on turnover I believe it would be much more popular.
I'd certainly be interested for a start.
This contest, as well as the previous one, counts all bets, singles and parlays, of any type on any sport.
Can you suggest a specific formula for calculating points for a future contest ?
The problem with the "highest profit percentage on turnover" that you suggest, if I understand it correctly, is that say for example someone gets lucky and wins a bet with a very high profit percentage, i.e. 700% ROI, s/he might not want to place additional bets during the competition period to retain the high ROI and the high position in the competition, which would be the correct strategy as far as the competition goes. This in effect will turn the competition into "Who wins a bet at the highest odds".