Best I can tell, that's (still) it!  I agree that failure to prove the amount of coins you have does not constitute a scam.  However, at the same time, if you are going to claim to have X coins, you should expect people to ask you to prove it if you are operating a business.

Maybe they would be better off just doing what Stunna does and having a max bet that they can obviously pay and just stop talking about how many coins they have.

Dooglus and just-dice has set the bar really high here for integrity, but that does make his practices a requirement?  If dadice doesn't want to prove they have a lot of coins that is their call.  

Likewise it is the community's call if it wants to play/invest there.  And while I like the way this was laid out by the OP, I don't think it rises to level of scam or quasi scam or proto scam, it just suggests what we all know, player and especially investor beware - this organization is not acting as honestly as the best in the business currently do.

Good Luck!