That's because he's AFRAID that people will learn that they can get motors with lower turns for less than half the price from Tower of what he's getting on Ebay.
If you have tried to wind your own motors and then have seen NML work I think you would have a greater respect for him. I really doubt that megatech motor from tower will be faster than any of NML's motors.
I read about NMLs stuff and he does have a good rep......the Megatech motor IS faster (theoretically) but it REQUIRES a turbo (which tower DOES NOT TELL YOU). I'm glad I did thorough research or I would've made my ESC crispy..........When buying one of these motors (mini-zs) look and see if it says ESC/Fett upgrade required or not required, if it doesn't say anything search the mini-z forums( on the tinyrc sister site) for the answer or just don't try it!!!!