It is hard to find manga titles that are posted on Paperbackswap. It is either barely posted or heavily wishlisted and I was wondering what is more likely. I posted three manga titles today that went straight to someone's wish. I'm wondering because I would like to know if adding manga titles to my wishlist is worth it.

when you post a book to your wishlist it tells how many wishes for that book had been granted in week.  You should look at that number and decide for yourself if the books are moving fast enough. What I like to do is to see if my library has it and then decide if i want to wait for the book to become available or go to the library. 

Oh, I didn't know that.

While it takes a while, manga is posted from time to time so it can't hurt to WL it. I've managed to snag a good amount of the Battle Royale & Vampire Knight books through the WL.

You also might want to check the Graphic Novels & Manga discussion forums.  Every so often someone posts WL books there that they want to send in multiples.  I also see several manga series in the Wishlist Multiples section of the Book Bazaar forum, so they are out there.

Can't comment about manga specifically, but if books I'm wanting here are wish list here and wait listed at my library, I put them on both.  If a copy becomes available for me at the library first, I delete the book from my wish list here and vice versa.

I've traded LOTS of manga here.  I used to have several ongoing posts offering manga, but since most of it is in storage now, I just have my mostly-all-manga WishList active.