there is only one pair of 181's left on firefeliz.com.  so once those sell, then these will be worth a bit more.  i suggest if someone wants them, then make some decent offers.
they are used once, still in great condition, that is saying a lot more than used numerous times.  and you can always remount.  just because they have been drilled doesn't make a huge difference.
if you're seriously interested, then make the guy an offer.  if you're not, stop hassling him.