They brought it upon themselves.
BNS should be photographer helping photographer, but short sighted people would rather count that few stingy dollars of lost as more important.
Like a particular lens seller, brand new is $1800, he die die want to sell $1650, who would want to buy at $150 lesser used when brand new is with full warranty. This shows his (and people like him) short sighted and stinginess. He maintained those sales thread for more than a year, every 3 days post once - like a part time job.
Nowadays people are selling that lens for $1100 - and still find it hard to sell.
Sellers should be realistic and stop thinking people trying to low ball, sometimes its sellers ownself high ball. Second hand electronics depreciate fast.