I have talked about some sort of trade system among my friends as well. Seeing as we drop a large number of seals (mostly brd it seems) we would be willing to work with any sort of trade system. The problem we have found that would result from this is simple. People are greedy.

If you could trade 5 useless seals for one good one of your choice or even random now members of your linkshell are gonna be competing against anyone needing any seal. Now you can argue it's up to the linkshell to distribute seals appropriately before they are all free lotted but come one we all know that won't happen. Another issue would be people spamming up easy nm's to get useless seals to trade rather then farm the appropriate nm because they can low man easier on a nm they don't really need. So now others that actually need seals off these easy nm's are gonna be competing against players farming seals to trade.

I do feel something needs to be done with these extra seals even I accumulate. If seals became tradable to a npc I do believe it would create more problems then it solves without more thought put into it beyond the trade ratio. For now I would settle for making a storage npc for them as it seems everyone with enough time will eventually level most jobs anyways.