Having dealt a little with merchant accounts and CC transactions you learn that VISA etc charge the seller a fee of 1-5% for transactions. That's how they make money. Usually its 2-3%. Many people set their prices assuming you will pay with a CC and give you that 3% back as a discount when you pay cash. When your profit margin is 5% a 3% loss means you will go broke pretty quickly.
Having dealt a little with merchant accounts and CC transactions you learn that VISA etc charge the seller a fee of 1-5% for transactions. That's how they make money. Usually its 2-3%. Many people set their prices assuming you will pay with a CC and give you that 3% back as a discount when you pay cash. When your profit margin is 5% a 3% loss means you will go broke pretty quickly.