What does the staking surplus mean? Is it the tokens that are shared among the stakers and the casino as reward? It seems every week there is a consistency in the amount of surplus.
EDG token is an Ethereum token and it is used as a chip on edgeless casino meaning you only can play there using EDG.
The number of existing EDG tokens is fixed, around 132 millions, no new tokens or deletion of existing ones.
You can participate in casino bankroll by staking your EDG tokens; doing that allow edgeless casino having a larger bankroll , serving more players and offering higher betting limits.
The casino network distributed 40% of the bankroll surplus in exchange for bankroll support.
You can read everything more detailed and better worded here:
http://staking.edgelessgroup.io