On the staking page, you can see the current profit pools for each coin type. USDT generally has the largest value in USD as seen in the picture, but these will fluctuate based on what the majority of players are gambling/mining with at the time and also the win/loss rate. For instance, if a player wins a jackpot you will see the profit pool will drop a lot in one day, if a player loses a lot on a bet, then it will increase. From these profit pools Betfury then allocates 3% of each token pool to the BFG token holders daily as dividends.
There is a 5,000,000,000 BFG token supply cap with 3,182,369,936 already in circulation. Of this 63% in circulation almost all are being staked at time of writing this. The remaining tokens are either yet to be mined or are part of the 1,574,648,181 (33%) that have already been burned. This leaves 4% remaining for mining and is why a vote recently succeeded which incrased the cost of mining. The more BFG tokens that are mined and staked, the more the dividend pool needs to be shared. This is called dilution, but Betfury tries to offset it by burning tokens at times.
Remember the dividend is 3% of each pool denominated in that particular coin, therefore the USD value of dividends can fluctuate a lot. You could have a shrinking dividend pool from less gamblers but an increase in the token value in USD, this would then maintain a constant dividend value. Ultimately we want to have a growing dividend pool from an influx in the amount of players and at the same time crypto incresing in value.