I put 7000km on mine had no problem at all. Unless you doing a lot of off-pavementI don't think those tires are bad at all. I put 1800 miles on my new 17 AT mostly on the road in dry and wet. Never had a problem and was able to lean them as far as I wanted to. Only did about 50 miles on forest roads and even at road pressure they where ok.
Having said all that I just put on a set of Shinko 804/805's because I plan a lot of offroad use this summer.
Good luck with the sale.