It would have to be a nonrefurb, unissued SKS for that price tag to be justified around my locale. And, it would sit for a loooong time too. (probably until I bought it)
Different localities with different values and/or disposable income might explain the price tag.
As crazy as GB prices have gotten, if the pawnbroker looked up recent auctions, he may have paid too much on a loan, and has to reflect it when the pawn ticket expired.