I'm having a hard time selling the 17-55. Damn thing is in mint condition, cleaned by Canon inside and out and shoved straight back in the box. $799 but nada. I wonder if the Sigma 18-35 is swaying peoples decision?I've had the exact same problem for probably six months. Still no takers at $700.
I think part of my problem is I am in a small market. I can't tell you how many people have asked why it is so expensive even though it is "almost the same as the kit lens".
If you have to ask... maybe you shouldn't be in the market for a 17-55. That's harsh.
Not really. It's a fair question. Your big problem is that the kit lens got a lot better recently. The focal length is almost the same, the newest version of the kit lens apparently has better resolution, less CA wide open, less pincushion distortion (though somewhat more vignetting and barrel distortion)....
The answer is obvious, of course. The 17-55 is faster, and for that extra bit of speed, you pay an extra grand. The reason resale is hard is that most people don't need the extra bit of speed. If you're just trying to get less DOF, chances are you'll buy a prime instead of a different zoom lens. If you do a lot of low-light shooting, it might be a nice upgrade, but otherwise, it probably isn't worth the extra cost.
Your best bet is probably to resell it through Amazon, honestly.