El Cid:
One possible way to address this problem would be to have the site keep track of the percentage of forfeits.  If an option was added to the tournament page that would allow selection of a maximum forfeit rate for players entering the tournament.  It could be percentage of forfeits or a maximum number of forfeits for a set period like a month or year.  IF the site tracks forfeits over a limited period like the last year it is possible for players to recover from their past high forfeit rates by routinely completing games.
Talen314