Since today all of our bets are now provably fair with a chance of doubling your chip equals 15 out of 32 (which is around 47%).
Does this mean house edge is more than 5% 
If yes than that is really huge and I don't think any wise guy will bet on your platform. I don't think gambling and mixing mix well however I have to say what you have developed is awesome and quite unique and easy to use mixing service. In the future if there is enough interest then will probably lower the house edge, they are probably keeping it high because they want their main mode of business to be the mixing service and not people just betting on dice.