I paid low 5's for a nicely routed one. Mostly stock aside from cliffys. I know of one in the last year that was high 3's straight off route. Otherwise they just don't go that low unless the person doesn't know what they have.
That being said my cabinet is in better shape and it didn't need a shop job. Yours needs a full tear down looking at how dirty the ramp is. It also needs some extended side rails. I am gonna say low to mid 4's.