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50k is a very large fee... Is there even enough items of high enough value to make that worth it wanting to be sold or bought to make this viable?
I think 10-20k would limit it enough without being crazy.
I agree that shops do better in small trade, curatives, supplies, clothing. High value items don't sell that well, that stuff is usually on market, so it would just cause less spam there.
Honourable, knight eternal,
Darkly evil, cruel infernal.
Dance with death forever more.
There's also the market channel.
I'd say 5k fee max to add your auction though. I just don't know what else you'd use this for besides nice rapiers and things.