It depends on the feature of the Casino tokens but it usually pump hard during initial listing of the tokens and just stabilize later on because casino is using it as a reward to all users that playing in the casino in exchange for there bets. The price is just stabilize because someone is buying either the casino buy back or other trader while players in the casino that gets the token as rewards keeps selling. Usually this kind of token shows an insane amount of growth after the token supply allocated for mining it is already empty which means there’s no new tokens generating to add in the circulating supply.
It’s not true that Casino token price don’t pump high because they are pumping on early stage if you will check the price chart using long time frame. Only those casino failed token didn’t pump much since the beginning due to lack of demand.
You could find many reasons why it could be given away or anything, but there are very little places where it would make sense to buy it. I always said that have a 0% house edge with token type of deal, where the people could earn it a lot and in that case if they earn a lot because they do not lose and the house edge is 0%, then they would have it all, and could use it for rewards and what not to get, if not then they will lose it.
Give people a reason to buy the casino token, otherwise it would be just rewards and that would not be really a good reason to exist, it doesn't make sense. BFG has a "bit" of good reason to buy, but not enough at all for sure.