I signed up and contacted a seller. In spite of all the java script the site was pretty fast. I'd still get rid of it.

Two points:

1) You need to get people using the site, and I have to second the observations that requiring someone to sign up to contact a seller is too much hassle. Most people used CL without an account for years before they signed up in order to post somethign.

2) Your search is broken. I listed books and searched on exact words in some of those listings, I never got any search results.