But that are not transferable therefore legally their sale value is useless it's like trying to get a deduction for the street value of weed
Wrong!
1. selling is not illegal just against T&C.
2. Donating points is actually according to the T&C.
3. If it were illegal I wouldn't compare it to donating weed to say simcha camp.
4. Soon weed is being legal.
(There are many factors that Is legal already )