Is it because I hate you? Is it because I want to remain an awesome MOCist and leave the competition in the dust? Partially. But that's not the big reason why. And to explain, I'll give you a situation in life that's almost exactly the same.
One of my coworkers is a magician. Not like one of those corny top hat and cape ones of Vaudeville, or those TV ones like David Blaine and Chris Angel. He's a street performer. He does his illusions subsided in a random crowd of unwitting people. He does it for fun, and he's quite good at it.
But he's told me that he hates to do his material for family and friends. Partially because whenever they see him, they always expect him to perform all the time and have new material. But the biggest thing is the people who want to know how the trick is done. They want it explained so they can pull off the same thing.
Magicians don't give away their secrets. They study long and hard to get to where they are. They aren't going to trade their hard work like that for nothing. Which, FYI, is why you'll never see any good magic tricks explained on the internet. And if you do, congratulations. You've ruined it for someone else.
This is similar to my position. If you ask me how my MOCs are made, what have you learned? Nothing. All you've done is emulated me. You haven't gotten any better at MOCing. Whereas if you try to mimic me from the somewhat decent images I provide, you're learning how the stuff fits together. You get something from it.
Life is a learning process. You gain nothing from shortcuts.