Ben,
If your sole purpose for coming to this forum is to post a part for sale, IMO you should not be welcomed here. Most people that have a join date within the last 30 days that come here to post an item for sale, have alterior motives. I lock their threads because I don't want other members to get shafted.
If they feel that they have something to benefit the community, then they need to become part of it. If they have personal references or links to other forums where they deal with a community and have no negative feedback, I don't see why their thread couldn't stay opened. 9 times out of 10 this is not the case, though.
Need I say more?