JayBuck$ work as a debit card, allowing you to pre-deposit money for spending. Participation in the program is voluntary, and it is not possible to carry a negative balance.
You already need to carry your card with you to access buildings. With everyone on campus accepting JayBuck$, why carry anything else? Whether you're doing a load of laundry or grabbing a latte at Java Jay, your JayBuck$ account is an easy way to pay!