Make it worth based on what you are using it on, local farmers market does this all the time for SNAP users.
Buying meat/veggies? Its worth its full value so you get $10 worth it costs $10.
Buying soda/candy? Its worth 1/4 its value (ie, you spend $10 of your SNAP to get $2.50 in junk, the rest gets recycled back into the system or such to help pay for your fatass getting diabetes later).
Make it worth based on what you are using it on, local farmers market does this all the time for SNAP users.
Buying meat/veggies? Its worth its full value so you get $10 worth it costs $10.
Buying soda/candy? Its worth 1/4 its value (ie, you spend $10 of your SNAP to get $2.50 in junk, the rest gets recycled back into the system or such to help pay for your fatass getting diabetes later).