It's interesting enough that I watch it .... but I can't help but believe that most of what we see is fully or partially staged.
Most days @ a vegas pawn shop will probably see nothing more than people trying to hock their rings & jewlery, an old stereo, DVD, tools or VCR..
The day(s) the camera crew happens to be there, people just happen to walk in 'out of the blue', right up to the counter & camera, & introduce thamselves with a $60,000 unique item, the $10K genuine 'whachamacallit" Rare things from the 1700's , oddball things ...
At the very least, (it seems likley), the people have been told to come in & re-create their 'original' pawn shop experience long after the actual fact, at worst, it's a complete fabrication, a friend that is known to own the item in advance, & told to bring it in so it can be 'researched' on camera.... Probably a combo of both, with the occasional 'real' customer ...