I really don't put much interest into casino tokens, although it can be a means to earn lots of goodies just like you said but aside from that no much interest besides haven't seen any casino that have gotten value up to a dollar, although that's from my own view but I guess some token might be out there that I haven't really gotten to know of but aside token haunt and gather I think whale.io have improved their casino alot as log in and other glitches have been updated. Kudos to them
Yes, casino tokens do add value to the casino and these days it is considered as a "tick in a box" to have a feature for the casino to have their own token. This holds more true for the new casinos as that attracts the gamblers to accumulate casino token too. However I do feel that the token should have a value and should be tradable. I think if they announce that those who are holding and accumulating Whale token will be rewarded well in future, it would be good.