If you want your BST posts to gain traction, you might want to consider one of the following:
- Clearly state in your title that you're only trading
- Actually offer the cards for sale
Three times today, I saw a listing in the BST that interested me. When I clicked on them, each one had "trades only" or something similar. Each time, it was a post of yours. I wasn't interested in trading; however, I would have made a purchase if possible.
As someone else mentioned earlier, there are some people whose posts they don't even bother clicking on. I'm seeing the logic in that mindset.