Re: Teak Decks
it is not the teak that is the issue....it is the installation and myriad holes drilled and tapped in to the sub deck (usually fiberglass) add in some delayed maintenance and the teak decks take all the blame.
If installed correctly, and maintained correctly, the teak will last at least as long as the boat.
Few sellers are going to welcome the pulling of perfectly good plugs to "see" something that is likely no indication of the quality of the deck....
rather look for softness in the deck, sponginess as you walk the deck, water stains and wood rot where you would not expect it, discoloration, copious rebedding and wobble gear or stanchions attached to the decks.
then look at the seams, again for looseness, sponginess, discoloration, etc as above.
best of luck. and do your research....teak does require care and maintenance, and the decks can be hot/hold heat in sunny climes.