Originally Posted by GLXLR
What if you accidentally scratch it up????

Not the customer's fault...anytime you see the "if you break it your bought it..." signs...not true. By putting stuff on display or allowing a customer to view the exact item they are considering purchasing, the merchant assumes 99.9% of the risk. The only time a consumer might have to pay is if the willfully smash the item on the floor. And they best have tape and non-employee eye witnesses to prove it.
I used to sell at antique shows all over the US and, well, it's a common misconception that the customer can be forced to pay. I have found almost all want to pay...I would tell them it's OK and my problem but most still wanted to pay, so I would sell it at cost or a very good price as I could.
Anyway, just thought I would pass along that tidbit...btw, that is one reason why many shops do not want to allow people to mount a lens, flash, whatever...also if the device harms your gear, people will try to sue the shop in small claims court for faulty gear. Pretty sad really...