You just stopped at the convenience store on your way to work and have filled your car with gas. You just trusted someone making minimum wage with your Credit Card information and the receipt will lay in the cash register drawer till shift change or longer . Next you decide to go take a client to lunch in a fancy restaurant. You receive really lousy service and decide you are going to cut the tip in half. Next you give this same waiter your Credit Card.
Revenge is sweet.
Most Credit Card fraud on the Internet is not committed by stealing Credit Card information, but by not rendering the services or products ordered. If in doubt check them out with the Better Business Bureau. You also want to look at their return policy, just in case. What you ordered may not meet your expectations and you may have to return it, after all you never saw the item. In most cases common sense is all it takes.