I think you are missing @tygeade's point here. He probably means where will dividends come from if there will be less gamblers but I think he's referring more to BFG miners. The introduction of staking (farming as Betfury calls it) kinda discourages mining. Apart from the six months locking period, the post-listing mined tokens will not be eligible for staking as stated in the rules posted by @CryptoNika.
As UserU also already mentioned. I don't think that the amount of gamblers will drop because of the staking feature. Personally, I will keep continue mining the tokens.
If the Betfury team notices a drop, they will try to invent something new to attract more gamblers again.
It because they do not offer a phone number for communication, and their email address is not visible on the website.
Come on, this is no disadvantage; almost no crypto casino has a phone offer for communication. And why would you even call it, if you can a much faster response in live chat.