I suggest you make live betting and when creating a coupon where the main currency would be to bet on gold. Of course, it could be done so that you could pay a 12% tax on the bet and then the owner of the game earns (when betting by gold)

Betting without rewards doesn't make sense 

This had been discussed in the past and the reason betting benefits can not be allowed was because it would flag the site as gambling site just like sport booking sites :)

Maybe, just maybe in the future updates something can be improved towards that aspect.