I watched a teak deck being removed from a boat in our marina. It was done with huge crowbars and much sweat, toil and money. Then the leaky fiberglass deck was ripped up and new fiberglass laid down......all because of the teak deck fasteners. Probably cost the owner $25,000.
Never, never buy a boat with a teak deck or add teak to a boat that does not have it!!!! IMHO!