i'd have to agree with this. Because once something gets sold or is posted up, you wont know if it's gone or still available if it's from page 2 and we're up to page 49 in the thread...
This is just an idea but the 1st post could include a list of sellers and lookers. The 1st post would also be regularly updated by a mod or whoever is in charge of the thread, as cars are sold.