Hrqls: Clo(w)ning backgammon is a special case. When it was first introduced, the rule for win was different. I don't quite recall how it went, but it took into account the number of stones. Under that rule starting 15, 21-point games made sense, and I entered 2 of those. Shortly after, the rules were changed to the present form, unfortunately also for tournaments that were already started. Some of those tournaments will outlive me. So indeed, I see no problem with the system...

I posted the following on the discussion board of Play Cloning Gammon for a prize. in January 2010:
Happy 3rd birthday!!
Please engrave on my tomb:
STILL playing Cloning Gammon for a prize.

It's soon the 8th birthday. We are still in round 1. No problem at all.