Charles Monroe wrote, "Teak is God awful expensive as you all know. What's
wrong with mahogony, oak, white pine or some other less expensive wood?"
In one word rot. Teak is used on boats because it provides the best natural
rot resistance. Check out this link and look under Marine Lumber
http://www.woodmatters.com/newsletter.html. The woods you mentioned may be a
reasonable and more economical alternative, but I don't think they would
last as long as teak.
Cheers;
Mike Schooley
Trailerable Trawler wannabe