I'm surprised about the Paypal "no help" comments. If there's a dispute, you go into resolution dispute, make copies of all correspondence between you and the buyer, make copies of your "push confirmation" email from your registrar, show the new whois information and tell Paypal CS that you've been scanned. I've been using Paypal for almost five years, and I've been chargebacked twice, but fought it and got the money back.
I don't know if this is a case of the chargeback being because the paypal account buying the domains didn't have enough money, but then that's what Paypal guarantees AGAINST. Too many domainers sell through paypal services, so Paypal is familiar with buying/selling domains processing.
You have to mail your evidence and complaint by snail mail, and it's a long process, but it works. As for "intangibles", a domain name isn't an "intangible".
Keep bugging paypal, get as much info as to how to resolve the issue as you can. If they're giving you the runaround, post their comments and any scans of emails or letters you receive from them. Then when domainers start losing faith in the protections Paypal is supposed to give them, and start cancelling their PP accts, maybe Paypal will look into these blatant style ripoffs.
Bottom line, if a Paypal payment is charged back, Paypal HAS to log a reason for that person's chargeback. You get a copy of that reason, then try to resolve it.
hope this helps.