I feel giving them more odds, will just make them rack up too many "tickets" or whatever the currency you use. What are they supposed to do with them? Idk, my vote is to keep it as is. Maybe add something else for RP / fun in the chat. But not something that gets more currency.
The heists are supposed to be for a gamble. not to Level up, or swim in stream currency. lol. sounds a bit too complex for my tastes.