eBay and forums are two different beasts. On eBay the buyer is protected both by eBay's policies and paypal. On forums it's more of a trust issue. Especially if you're asking people to pay you via gift option in which case they don't have any means of protection at all if something goes wrong. I'm not saying anything would go wrong, but the gift option is for an exchange of funds between friends and family, and the pay for goods a security measure for buying stuff off of the internet.
if you have a bank account linked to paypal you don't pay any charges
For a £10 payment(Image removed from quote.)