I think that it is against the WGT rules to post the names of the quitters. I always post a note on their wall and a note on the wall of their country club owner, that seems to have small effect on them.
In terms of quitting to protect your average while that happens all the time, at least when players quit in non ranked games it just ends their participation. In alt short, challenge and ranked games you end up in the lobby waiting forever.
Obviously the percentage deal didn't work as a rating but something is needed here.