Store auditioning and then buying on-line from others. How do you feel about it ?

I have a "personal rule" that I will not buy used, what I listen to in a store, until it is a generation old, and they are not selling it anymore. 

I will buy used, at a price I can turn around and sell, just to hear the product. That is fun for me. This is easy except for speakers, but I am starting a collection of those.