That way gamblers can continue to bet their betting-coins like crazy, show off their big wins, and maybe even exchange large amounts of "earnings" for non-cash prizes, arcade style, depending on what the betting platforms decide to offer to the market. However, win or lose, there must never be a way to top up or increase token wins by spending more money on said platforms.
Edit: Maybe, with effective regulation ensuring gamblers cannot open (and thus spend) more than X simultaneous gambling subscriptions across the market, large betting-token earnings could be allowed to be exchanged for cash prizes, to the extent the gambling platform may consider it profitable. Of course by its very nature this would make top cash winnings orders of magnitude lower than when betting actual money, given the flat income stream. But that would itself be the point, providing no incentive for gambling business to encourage addiction for greater profits.