Pictures play an important role in grabbing a viewers attention, and also shows that you as a seller, have nothing to hide. Bottom line is that the better you can get your photos to look, the more attention you'll grab from viewers, the better you will look as a seller, and hopefully that translates to more buyers and higher market value on your items.
I was going to post my 100mm Macro USM for sale on the Internet, and obviously everyone wants to ask the condition of your gear. Here's a simple technique I use to get clean sharp images for the Internet. If you already own a Canon flash + 7D, you've got the perfect setup. The Canon 7D has a built in Wireless function to fire flashes off camera. For the Cocoon or Product tents, you can find them for sale here.
Other Light Tents on Amazon