I’ve introduced many of my (non-Jewish) coworkers to a really good schwarma place near the office. I would say they get an additional $100/week from people I introduced. Its my way of helping out my fellow Jews (and they have awesome food).
Honestly, I’m not the biggest fan of the voucher system. I’m not fond of requiring everyone to pay for dinners. I’m tired of all these extras that are piled on top of tuition when tuition is already so high.