Classifieds anyone?

As a long time Craigslist user, I have been lamenting the sheer number of ads and junk on the Craigslist bicycles section as of late. I’m considering starting a premium classifieds portion on Thoughts? Ideas? I’ve begun researching classifieds software, there are some nice ones out there that are simple to use. I will be up front and say that I do plan to charge a small fee for posting ads, probably 99 cents per ad, but I won’t do this until there is significant traffic (which will probably take awhile). I want to do this to discourage people from posting junk like they do on Craigslist.