Changes

Players can quickly earn the star tokens required to purchase all items in the shop by betting green, since the mathematical probability the wheel will land on green is 75%, versus 25% for orange.  The probability is not a guarantee for any single roll, however. For efficient profit while protecting against losses, always bet half of your current stars. This can be calculated using the Kelly criterion for bet sizing:  

Players can quickly earn the star tokens required to purchase all items in the shop by betting green, since the mathematical probability the wheel will land on green is 75%, versus 25% for orange.  The probability is not a guarantee for any single roll, however. For efficient profit while protecting against losses, always bet half of your current stars. This can be calculated using the Kelly criterion for bet sizing:  

Proportion to bet = Chance of Winning - (Chance of Losing / (Payoff Ratio - 1)).

Proportion to bet = Chance of Winning - (Chance of Losing / Profit Margin on Win).

Simplified for the case of doubling a bet we get  

Simplified for the case of doubling a bet we get