I agree with JRayers - > vBulletin is not a good base for a marketplace

1) One of the most basic SEO optimizations should be to remove "-Powered by vBulletin".

2) Current title structure looks spammy but is a good way to get higher ranked faster for those particular keywords.
---> i) With SEO speed shouldn't matter; be patient - make the right changes.
---> ii) At least remove the full title from being appended to the thread title

3) Art you want to make money from this website; it seriously would benefit you if you hire a pro to help you out with your SEO.

4) GET vBseo and vB 4.0 ASAP to get rid of this horrible Template(just look at the html - ew) and URL structure.

5) Posting after ages - woo