Terms:
"BetKing reserves the right to cancel the promotion at any time or change prizes for any reason.
To qualify players must wager 0.001 BTC or more during the week or the equivilent for the LTC, ETH, BKB leaderboards."
Participants (myself included) should have known and accepted the risks into our decision to play.
Just as a FYI: This part of the Terms was the reason I didn't join the wager contest (with BKB). I especially like EV+ promotions, but this part I can't control.
It could be that more people didn't join because of this.