
If I want to sell a product, MPB will give me a good price, and it’s nice to know that they’ll thoroughly check it and provide an accurate description to whoever buys it from them in due course.
The only time when I personally would buy a secondhand item from *anyone*, is when that item is discontinued or unavailable new (e.g. EF 180mm macro, or previous iteration big whites), and that is when I’d buy from MPB.