I would imagine that even adding an inch would create problems with stress points of the forks, etc... I would think that even larger tubes (50mm is already huge) and bigger shock shafts would have to be made to keep stress and flex in line, not to mention the differing geometry created with linkage and shock mounting points. With the larger tubes, you start adding weight, along with re-tooling for differing valves, rods, etc., Kind of like the new 20 inch front wheel. The choice and price of components skyrocket and eventually leaves the customer with less overall choices. Please pardon all of this conjecture, as I am purely speculating at this point. I, for one, dont know that I need more than 12 inches of travel. If the obstacle is that big, I really dont want to rely on that one extra inch of travel to make up the difference. I guess that is part of getting older. One last thing that strikes me: Even if you are fairly tall (I am vertically challenged at 5'9), we will still have to cross the same terrain as you in an enduro, regardless of height. With those darn freestylers hitting jumps in excess of 100 feet and being able to land them, I would imagine that 12 inches of travel will do me just fine.