I put in a new feature request that may help figuring out quickly who trades only vs buying and selling without reading through all the profile. Members would have to use it to make it work. That maybe the problem.
Add an area on members profile. Maybe this could be below Collection: and above Collects: on one's profile.
I'm willing to: Trade Sell Buy (even) Send cards per PWE (Maybe in red to stand out)
This area could be where member adds it or appears when you check the boxes in your profile. (like turning off your trading and others)
I understand members can and do put this in their profiles but some time the profiles get really long and members do not read them. This would help members only wanting to trade or sell or buy.