While I sympathize with your frustrations, I believe a bit of perspective needs to be added to this thread.
First, your use of the term 'cheater' is misplaced. A cheater is someone who breaks the rules to gain an unfair advantage. There is nothing to be gained by quitting an alt shot round because the alt shot round has no material value. There are no prizes in alt shot, its basically a fun format for folks to get together and play. Even in an alt shot tournament quitting can hardly be called cheating as any material gain is sacrificed by quitting.
As far as losing the cc pass xp's goes, you've been here long enough to know there's a whole multitude of issues, many under no one's control, that can cause those xp's to be lost. Moreover, there are many more reliable options than alt shot to gain the daily xp bonus. A ranked, solo 18-hole round yields as many xp's as a 9-hole alt shot round with a far greater likelihood of completing the round. It seems disingenuous to me to penalize someone for quitting simply because you 'lost' xp bonuses as there are plenty of other options available to gain those bonuses.
Furthermore, I find nothing in the T&C's that specifically addresses quitters. However, there are consequences for 'blaming & shaming' as Callaghan suggests, at least as far as publicly naming said players. No one like quitters, but for WGT or anyone else to hold even a virtual gun to someones head saying 'You WILL finish this video game or else!' is patently ludicrous.
Just my opinion. Your results may vary. Good luck.