It depends on what you have?
I've been selling off my spares, mostly on free listing days, over the last 6 months and most seem to only go for Ã'£5ish.
Managed to sell some, like the Sandtrooper (white pauldron and droid) and Snowtrooper for Ã'£15 but generally there is very little interest in the line.
I did get an offer of Ã'£55 for my Tarkin and Gunner 2 pack a few months ago but the buyers feedback was horrific so I declined.
I think Sideshow has put a lot of people off although there are some reasonable 12" Hasbro figures and there is no way that Sideshow and others are going to do every single figure again. Also postage is high on these items - which also puts people off. People will buy the Hasbro Fett as not everyone has the cash for the higher end stuff.
If I was doing a show or car boot I think you would have a better chance of getting rid as people would pay a little more when not having to pay postage - the 12" Han and Tauntaun is quite impressive in person but not when you have to add Ã'£10 to the auction price for postage.