If, for example, you have two kids and you buy each of them eleven Christmas gifts and you drop your Santa’s bag on my doorstep, that’s twenty-two wraps. Pay for twenty. (Enough savings to buy some Barbie Doll clothes. Or a pint of decent gin.)
Or…
Let’s say you discover that you really like my work, you find it easy to convenient to patronize (like, maybe, your favorite dry-cleaner) and you want to use it throughout the year. I’ll keep track. Kind of like a coffee shop or book store punch-card. Buy ten, get your next free! Thanks for being a repeat customer!