I tried it in 2015 and then played using dogecoin all works fine so what you want to question?
My suggestion for the moment do not use Bitcoin to bet because your game will be hampered awaiting confirmation you should use some other coin
Eth, Dogecoin, LTC DASH
You are right - the question is:
Using Direct Bet and this strategy - how many losses in raw did you experience? My maximum was 9.
So in order to win - initial bet should be 0.0025BTC (I think their maximum is 7BTC)