Never had any luck really, on eBay. Came to the point of just assuming that all sellers fell into one of two categories: 1. those who don't know anything about pens, and 2. those who think every pen they have is worth the highest premium price. My experiences in contacting the sellers has not changed this opinion... yet.
I have much more modest tastes. I would like a semi flexible needlepoint or extra fine with good snap. It can be in a standard 52 body, faded if necessary (it's all about the nib for me) but getting a decent condition would be quite nice too. For me this is a pen that represents a daily writer and not just a curiosity piece.
I put out the challenge to all the sellers: place your pens on eBay with a $1 starting price. Let the market decide what they are worth.
This is a challenge that no seller will accept. I think it's pretty clear why, but you should draw your own conclusions.