Holding back actual avail coins to “double”

How is that some players are able to hold-back their actual $ of coins so they are able to double a bet -  YET not lose all of their actual bank?  

I’ve seen MANY players double on me with a bank of say $50 and once the game is over I see their bank $ increase immediately to re-fill for another game?

 #1, This is CHEETING #2, It’s unfair to those who bet on their ACTUAL bank and allow the opponent to guarantee they only lose a specific number of coins- avoiding having to pay to replenish. 

It’s easy!

you are playing with virtual money, not real money. So, The software gives better luck to players with higher levels and lower bank, inorder to keep them in the game. 

Try to bet bigger and loose a lot of money. You will see your chance will get better when playing with people with lot of money.

I studied the software for about a month now, kept all the records, and i have to tell you dice in this software is calculated not random. 

Here is the real question: why is this software free? What you are paying them if not actual money?

:)