They break if you try to move them!
Not just fashion. Think about cars. The drop in value as soon as you drive off the lot. How much would one be able to recover if the buyer decides to sell it just one week later? probably not 100%. It is the same car with everything functioning the same way before he drove it off the lot.
That is why it is worth spending time on B&S. You will surely have some hits and misses, but the really good hits make up for it. Knowing your measurements is very important for successful shopping. That and don't be a d*ck and throw out low ball offers when you know you are getting good value (not saying you personally, just making a general comment).
Ugh....don't get me started on low bawlers on B&S.