Paying your loans with zinc

My dump bank branches have sweet cummins coin machine. It just so happens, that it’s the same bank that services my wife’s student loans. Monthly, they deduct the loan payment from her account. Yep, they’re getting the load paid in zinc. And considering the loan has an APR of 1.88%, no reason to prepay. Plus, I’m happy getting a small tax deduction from that interest.
Anybody else paying their debts with zinc pennies?

Anybody else paying their debts with zinc pennies?