IMHO,
I really think the "My Trade List" is good already.
But the trustworthy of the seller is more important than anything else.
Maybe the management can start to ask for more details to be a confirm members or sumthing like that??
Like lelong.com, where if you r verified or ordinary member??
LYN team can ask for photocopy of ICs, bank account numbers or any other things that can at least show some details of the seller/buyer.
Just my 2cents though!!!
Cheers!!!