This is actually quite brilliant and fair.

However, you've only made about 0.2btc in 6 months which probably doesn't even cover hosting charges.

You need to increase your cut from 1% to 3% and promote it more if you want to be successful...

The winning payout is more than large enough relative to the total paid in so to increase your profits would not put anyone off.

The fact is that by far the most players are the minute free ones but the  game has a potential for attracting more serious players if they knew about it.