I'd guess they sell bulk lots of stuff ( at a reasonable price) to select vendors at a "discount". Maybe a near new $100 cordless drill pawns for $20-25, they want $85 for it. I'd pay the $100 at HD instead. When they get overstocked the 3-baller might sell SHIT like that to a volume buyer for $40-50 ( doubling their money). Then that guy might get $60-65, when he paid $40.
Aal-jays ( sp?) in Vegas does a lot of tools and sells at Broadacres in Northtown. Forget about a deal in the shop....just go to Lowe's.
It's different with the bread and butter items like scrap gold and silver coins ! Most jewelry is only worth its' scrap value, IMO. Who wants your wedding band from your 1st marriage ? I'd love to get into this business ! They have you by the balls and they know it. Crackheads will sell cheap. Something like common silver coins are untraceable, pay the crackhead half price or less, PO-Lice will never be able to identify it as stolen property. This game is as dirty as Gambling.