In my personal opinion, investing in casino tokens is somehow on the borderline. There had been some projects before but they seemed to fail. It really depends on the Casino's performance since some casino do really have a good marketing strategy and some casinos that are performing so-so. I think the speculation isn't different from those ordinary tokens but the advantage of gambling tokens is that they have utility on the gambling casino they are integrated with. So better to do your own research and see it yourself if the gambling token is worth investing.
The performance of gambling tokens is dependent on the revenue of the casino though they are also affected by speculation, they do not follow BTC movement because they have already utility and that utility dictates the performance of the gambling tokens.