Would you consider posting a link to one of you listings so we could take a look? Or alternatively you could PM me or Marc with it.
It could be that your listings are missing something or putting buyers off in some way.
One thing to try is writing a call to action at the end of your listing description - e.g. "Bid now to pick up this top-of-the-line Dyson vacuum cleaner for pennies on the dollar!"
Sounds simple, but I've noticed it makes a difference to my eBay auctions and increases overall activity.
Other things to try:
*Make sure your description is very comprehensive and emphasizes the benefits as well as the features.
*Add at least 5 good quality photos to each listing - more photos is proven to increase conversions.
*Add a good FAQ and make an About Me page telling buyers more about yourself and your business.
Hope that helps!