Completely agree with this, $5 can be the difference between a middle manager swiping a credit card and a tough conversation with a GM and procurement (ever had to procure AdWords before?)
And, although in these days of Stripe & PayPal, etc, it's not such a big deal, the ability to take credit cards for bills is the difference between being paid immediately vs. waiting 6-9 months for the invoice to be paid because you're not an Approved Supplier and Purchasing needs to get a waiver to pay you.