Nah, I don't think we need 'Wanted' ads mixed up in the 'For Sale' section. In a slower section, maybe, but our 'Sales' is a fast-moving section, and why would you want to trawl past (possibly confusingly listed) 'Wanted' ads, if you were looking to buy something?
If you were needing to sell something, after you'd listed it in 'Sales', it wouldn't be a bad idea to check in case somebody is after the very thing in 'Swaps and Wants'.
No, 'Swaps and Wants' is a good section. The threads might not always seem to get lots of replies (some replies we don't see of course, made via PM or email), but the threads do get plenty of views...