Who is telling you that?
Have you sent the email to spoof@ebay.com?
Some sellers do accept credit cards directly. These are usually sellers who also have B&M businesses, and those merchant accounts have been verified by their bank, so you should be okay sending the information.
We had a few customers (on and off eBay) who preferred to pay by cc, and who would send us thier card number over two or three emails (partial number + partial number+ expiry+ whatever you call the number on the back of the card).
Which was fine , but most, like you, preferred Paypal for its simplicity and anonymity.
Even when they had been in the shop and met our staff in person.
