Personally my list of things I won't buy used is very short, like undergarments, and personally hygiene items, of course certain things I critic very well before I buy them. However I am curious what is on your don't buy used list and why?
I buy a lot of second hand items, but I would never buy second hand undergarments, shoes or headsets. Maybe I am wrong, but I think that they are too personal items and should not be re-sold.