hassanr, i had almost exactly the same experience with hilary stone.
the listing came off as all honesty (rusty bits photographed, etc), every detail well listed, but either that was a way for him to cover up for the other issues the frame had by appearing open, or he just doesn't know frames very well (hard to believe).
the frame's seatpost clamp is fucked, way overtightened so the tabs are mush and a post will not stay up (not photographed or mentioned) almost making it unuseable (only useable with an additional clamp over the top of the tube).
i took my frame to a local shop to get it sized for a seatpost and the owner wouldn't sell me a seatpost because he said the clamp had been overtightened. it does look a bit "pinched". but that guy is also a miserable cunt, so i took it to another bikeshop down the road and they sorted me out... i've had no problems with it since. did make me feel shit about the frame at the time though.
in addition his communication is awful. after i had payed i asked him to notify me when he had shipped the frame, which he didn't even bother to respond to, let alone notify me of dispatch. and even though i had left him positive feedback (after i had received the frame but before proper inspection, my own fault) he has still not left me any feedback, almost a month after i had bought the frame. i've sent him at least two messages asking for feedback, to no avail.
he took about 2 weeks to respond to my message asking for his contact details after agreeing that i could pick it up from his house. then when he finally responded he just said that he had already left his number (on the eBay invoice which I hadn't checked).
actually, neither of these point to him being a cunt. just me being an idiot.