They should be of interest to those in the know. You have a choice of getting the surrounds replaced by a reputable tech, but be aware they will be significantly different than the factory surrounds, which are no longer produced. It's also possible that the woofers may need a re-cone.
What you're asking is hard to define. If the woofers are shot, that would significantly decrease value. How about the horns? They might need new drivers, or not.
A pair in good shape should bring $600-$800, but these? I'd bring a penlight battery and some speaker wire to test whether or not the drivers do make noise. If they are functioning, I guess your bidding price will be contingent upon how badly you want them.