It depends:
- Posting: No
- Meeting in person: No
In the first case, you are exposed to a stolen account resulting in a chargeback. In the second case, you are vulnerable to the “buyer” reporting that the item never turned up and requesting a chargeback themselves. You can have all of the evidence that you could imagine, including a photo of you with the buyer and eBay may well still side with them.
FWIW, I’ve sold plenty of stuff on eBay and Facebook and rarely had a problem, but I’m very aware of scams and have turned more than one buyer away for being too risky. That said, I bought a CX bike for my son in the exact way your buyer requested, from a seller in South Wales. He was genuine and we struck a good deal, but I’ll admit to having a few nerves until the bike turned up. Not sure I’d do this again!