I think depends on what your selling. If it's an item that's related to a user's profile (location, favorite bands, movies, etc) you can do quite well. I always

I think depends on what your selling. If it's an item that's related to a user's profile (location, favorite bands, movies, etc) you can do quite well. I always click on adds for new albums or concerts for bands I have listed. Much easier for me than setting up alerts on a third party site.