| Craiglist can definitely be frustrating. Check the price of what you're selling on eBay, and list it comparably. Like the other guy said, maybe a little cheaper. And say it in the ad, i.e. "This cab is selling on eBay for $500, so it's a steal at $400" or whatever.
Also, unless there are serious problems with the cab that need to be addressed, don't get all nit-picky with describing small dings or scratches. These things will only deter potential buyers. A guy who comes to your house with cash in hand is gonna buy the cab with or without a little bit of wear. But you may never get to that point if you go into explicit detail. To be clear, I'm NOT saying that you should try to hide any issues that would affect it's playing quality. You just don't need to describe every little flaw.
Another thing I've found with my experiences on CL is that if you're willing to negotiate, people are more likely to come around. A lot of ads I see say something like "$500, price is FIRM" and I think that turns people off. If you want $500, then say "I'm asking $600, but I'm willing to negotiate." Then when the haggling ensues, you can still get what you wanted, or close to it.
And lastly, be diligent. Post a few times a week. Reword your ad, so that CL will allow it, and stay on top of it. It's just a matter of time till someone is in the market for what you're selling. Good luck. | 
