I also am surprised at the level of whales gambling here but mostly they do so because of the sideline prizes because the house edge 5% it is sure to crash every gambler during the long run,they offer daily and monthly jackpots together with tickets and other bonuses to attract the players and being near the Lambo draw this activity increases.
Yes, the 5% house edge is really a lot, and it means that many players will constantly lose in the long run. However, I guess that gambler has some effective strategy that allows him to minimize losses. Obviously, it would be reckless to wager 11 BTC without any strategy because daily jackpots, RP, and other prizes don't compensate for losses due to the house edge.