"The fee is too high."
It's the sticker MDR you're reacting to, not the net cost. Subtract the carrying cost you eliminate, the collection time you get back, the bad debt that goes to zero, and the tax deduction — and the net lands in basis points, not percent. The fee is real; it's just smaller than the wait it replaces.
"We prefer ACH or wire."
ACH can be reversed and the timing still drifts. Card pays you in 1–2 days, the funds are guaranteed, and the remittance data reconciles cleanly against the invoice. You're trading a slow, uncertain "free" for fast, certain, and self-reconciling.
"Our margins are too thin."
That's the reason to do it, not avoid it. Card is a collection tool — it gets you paid faster, kills bad debt, and frees the cash you're borrowing against. On a thin margin, eliminating a single write-off and the carrying cost matters more, not less.