I can share the experiences of family. Basically, don't do it. It was a mail box store, but not a franchise (not UPS). The mail box rentals income they had basically paid the rent. The owner's son worked it, but they also had to have an employee. They also had an assortment of other products for sale, in addition to packaging boxes and supplies, but nothing really took off. Eventually, after a year, they sold it for a loss. I've been to the shopping plaza since, and its been many years - its still a mailbox store, but I've heard its changed hands a few times since.