I still believe that the solution to "rigging" and the betting issue, is to have more variety.
The reason this issue came up in the Asia-Pac server is because of lack of variety.
The same players, the same server, the same guild wins most of the top 8 CWF slots every week.
Yue is bored out of her wits, so is probably just sharing the CWF rewards to her guildmates.
Merge the Asia-Pac and Europe CWFs together.
Two timezones can have a common CWF time between them.
(An example is that Morning in Europe is Afternoon in Asia, Lunch in Europe is Dinner in Asia)
More challenges = less chance for "rigging" = more spending = more fun