Sorry, you are not trusted enough. All of your sales were with people who you sent first to OR used escrow.
I would gladly use escrow if you would allow it. I would record me opening the envelope on receipt for both of our safety.
If you have another way of protecting ourselves if I trade with someone not trustworthy please do share. This is the only idea I have of preventing myself from being sent $1 and then not having any way of proving to escrow I was scammed.