I think if DandD had ever participated in the Piggy Swap she would understand why a lot of folks are not keen on the broker or one to one swap, whatever you want to call it. See, it sounds like she only wants to share her seeds with people who have seeds she wants if I am reading it right. That's not the point of the Piggy Swap. It's to share what you have with everyone on a first "oink" basis, not just because they have something you want. And you can get some great seeds from someone without having to worry if they will want what you have to offer.
Some people are newbies and have only a few seeds to offer. With the Piggy Swap, they have an equal chance at getting any of the seeds offered.