So tried with 0.02 BTC and it did not end well

Is there any actually proof that the house edge is 0.5%?
To understand the house edge, here's an example:
Suppose you're betting 1BTC against the house at a 50% chance, if you lose, you lose 1BTC, and if you win, the percentage taken by the house from your winning is the house edge, that is:
under a 0% edge, you'll get 2BTC;
Under a 0.5% edge, you'll get 2*(1-0.5%)=1.99BTC, safedice.com has this;
Under a 1% edge, you'll get 2*(1-1%)=1.98BTC, Just-Dice, Primedice and a lot of other sites have this.
