Simply be very cautious if you still want to sell, but if in doubt don't proceed. You may loose a sale but you will still have your equipment to sell another day. If you have spoken to this guy ask him for his Telephone number - and not a mobile one either. If he refuses that speaks mountains about him.
It is a personal thing with me that I will not do busines via E Bay, there are too many crooks out there to take a chance. A real thieves paradise.
As for PayPal I am not so sure about their ethics either. True most of their transactions seem to go through OK but once on their books you will have a lot of difficulty getting rid of them. Their HQ is in Luxembourg and the one and only bit of business I did via them resulted in countless auto-generated E Mails, until they seemed just to get tired of sending them with no responce..