Xether proposes loyalty program for active players, namely a discount on the commission from stakes up to 0.5%:
0.1% - 20-100 ETH
0.2% - 100 - 500 ETH
0.3% - 500 - 1000 ETH
0.4% - 1000 - 5000 ETH
0.5% - more than 5000 ETH
For example: when player reached  total amount of all his stakes more than 5000 ETH, the house edge become 1.5% (2% - 0.5% = 0.5%)