True, the more you condition, the more it'll wear on you, but have you ever tried hitting anything with your shins before? You need to build up the pain tolerance there. I think, though, that maybe this page has gotten a bit off track. If you're looking for a practical art, then yes, mauay thai may be for you. Any art, sport, or activity will wear on you eventually, though. You've just got to figure out which art is right for you, be it competitive, reflective, or recreational.