Even if someone paid with a credit card that met you, and showed you photo ID, and signed the receipt, can do a chargeback, and you couldnt do a thing about it.
Well there are many things that could be done about it. Most of them legal
![Grin](https://bitcointalk.org/Smileys/default/grin.gif)
Lawsuits. Fraud charges.
The main risk would be everything was fabricated, which at these dollar amounts would not be worth it. If you had a someone elses credit card and wanted to use it to steal, you would be better off using it to buy items at a big store where it would be written off. Not dealing with an individual who has far more incentive to deal with getting back at you.