favorites on KSL.com. Which means, assuming you are using KSL, that you aren't being "seen". What is your hit rate?
You may need to delete and repost every other day to get on the front page results for a bit. Or as others have said, maybe your price is real high?
I've waited months to sell cars. I've also waited mere days. It just depends on if what you have is what someone else is looking for.