Karen, I think that much is up to you. I don't think anyone in this swap is keeping track of your contribution to dibs ratio and, even if they were, I don't think any of our members mind that you get a lot of seeds. Without you 'adopting' or seeds, they would be extras going to waste.
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That said, however, it sounds like you might be sort of a 'rules' lover like me and may be concerned about breaking the unspoken tit-for-tat rule of fairness that is embedded in our society and daily lives. If your conscience is eating at you like it often is wont to do in these situations, you are more than welcome to ease it with a pay it forward system of your choosing or other means that you like.
I can't say I know exactly how it would work, but I'm okay with you setting it up with other members. Please know that anything you get from me in this swap, though, comes with no strings attached, no expectations, no hard feelings whatsoever. Please just give my seeds a great home.