Basically, if you have a personal account, you can only accept payments which are funded by cleared funds. This means that you can't take payments funded by debit/credit cards.
https://www.paypal.com/uk/cgi-bin/webscr?cmd=_display-fees
http://pages.ebay.co.uk/help/sell/questions/upgrade-paypal-account.html
PayPal has logos that you can insert within your auction for sellers who only accept balance transfers and echeques. They're available at the PayPal website. You'll have to manually insert them into the body of your auction description and you won't get the little PP logo next to your auction listings. A seller should not fly the CC logos if they don't accept CC payments. All the manual Logos are found at the PayPal site.
Go to Auction Tools>>Manual Logos.
A visual example here:
http://www.practiceboard.com/?4020105
Here is a "ME" page which answers many of the questions regarding safe use of PayPal.
http://cgi3.ebay.com/ws/eBayISAPI.dll?ViewUserPage&userid=bella*s-posting
You might find this interesting:
http://www.paypalsucks.com/