My two cents, if anyone cares:
I keep meeting ebay sellers that are using credit to buy their stuff for resale.
Just last week, there was a guy playing "auction king" at an estate auction that I attended. The guy was buying like crazy, and paying high amounts for the items he was buying.
I struck up a conversation later with him, and he carried on about how much he was making on ebay. Later in the day, he admitted he had run up his CC bill to $8,000 for ebay purchases. "I gotta start working that down" he said.
Even later in the day, when we were chatting about some of his buys, he got nervous and said "I don't know much about this stuff. I usually buy a lot and see what sticks."
It is simply crazy to me. He spent, on one occasion, $300 on three items, and I doubt that he even clears a real profit, that is if he can get $300 back ($360 after BP, CC surcharge, and sales tax.)
The bottom line:
Many people cannot manage credit.
He is giving up 19% in interest on that CC.
You make better buying decisions when you use your own cash to fund your purchases.