I used to, but it hardly seems worth the bother these days. Years ago, there was less competition, and it was more like a giant garage sale/flea market; now many of the sellers who have the same types of items I have are selling in huge volume, often things new with tags.
By the time I take pictures of everything, upload the pictures, write the descriptions, pay the listing fees, package the items, pay final value fees and make a trip to the post office, I really don't feel like it was worth it. I can spend my time better doing other things.
Really, though, what you have to sell makes all the difference - if you have unique, in-demand items, it probably would be worth it. My husband wants to sell a popular discontinued guitar, and that'll be worth the effort.