...But then again, all you can do is believe me or not

I have no reason not to believe you. But Im interested to know what percentage of the slot return to the player? I believe that these figures should be accessible to everyone.
I doubt that is really something that should be shared with the public, I mean they can if they want to but that is not a data information that they should be forced to give up. If you wanted house edge then sure, if you wanted odds sure, if you wanted anything related to you gambling here then you should definitely get it.
But, the question of "how many slot players return after gambling" is not really something that affects the way you gamble, maybe psychologically it does affect it but it doesn't affect the real outcome of your gambling so I think if they want to hide that information they should.
We could literally ask how much has been gambled on this website so far and how much profit mintdice made so far out of that and we have the right to ask that, doesn't mean they can't just decline it.
I agree with you on this. I see no obligation for the casino to share this info. This info is their logistic which they use internally to assess how their business progresses and since this does not affect the players then I see no advantage for the casino to publicise this other than them wanting to do so