So they will pay for the guns then they will be stolen later.
Cops at these ‘buy backs’ recognize most of the ‘sellers’...(yep, lots of thieves are arrested more than once, twice, twenty times+...)
Here’s how it works: Criminals steal guns when they break into homes (along with cash, jewelry etc) then allow ‘the gullible’ to buy the cheaper guns back (that they don’t want) then use the money to buy better weapons and tools (on the street).