Ok I see a lot of whining about top players not accepting games.
I would like to suggest a ladder system for members only, where players can challenge a higher rated player, subject to certain guidelines of course (ie. must be 5 day moves, may only challenge once per week). I have played in several different leagues at Cases leagues..www.igl.net, where top 20 ladder players must defend their position every week, (this may be to short a time for a dailymove site) they must also play a certain amount of games outside of the top 20 to retain their status, tournament games are included in these numbers. GT also offers something basic along these lines in its club format, where a lower rated player may challenge a higher rated, only 1 challenge per player is allowed at one time, it has its faults but could be the basis for a working ladder system here.
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It would be easy to set up a cases league for this site however it does mean accessing another site for stats and to enter losses which some people may find a pain in the butt.