In *Star Trek: First Contact*, Picard plainly says that there is no money in the future:

> 
> **Picard:** The economics of the future are somewhat different. You see, money doesn't exist in the twenty-fourth century.
> 
> 
> **Lily:** No money! That means you don't get paid.
> 
> 
> **Picard:** The acquisition of wealth is no longer the driving force in our lives. We work to better ourselves...and the rest of humanity.
> 
> 
> 

Does that mean that there are no stakes to the poker games played by the officers on the Enterprise-D? Or were there alternative stakes that didn't involve money?