The anchor
You're running two economies through one till
Your regulars pay the bills. That's what they're for, and they're the most valuable thing your business owns.
A brand new customer has a different job. New customers need to pay for themselves and pay for the next one inside thirty days, because that's when the next round of advertising falls due.
Almost nobody separates the two. It all goes through one till, so most owners are quietly covering the gap themselves, out of the register or their own pocket or a loan, and have never once decided to.