This will make for easier scanning of items and autos for sale and if you are trying to sell something you can highlight the WTB section in your searches, so that results will only show members wanting to buy your item, and not selling it.
I think it makes it easier and clearer. Especially if you are sick of seeing people whine about users forgetting to put FS: or WTB: in thread titles. It works well on other sites.
With them both together, the WTB posts get more exposure. How many of us have parts stashed away that we don’t think about selling or getting rid of until you stumble across the WTB post. I think it would make it more difficult for the WTB posters to find anything.
what about being able to filter the sections? like not necessarily make it a separate section, but have the option to select one or the other. just a thought.