That's because everybody looks foolish pulling a gun from their nether regions.
I wish sport jackets would come into vogue again. That would solve a lot of our concealment problems.
I have seen one video, it was for a specially reinforced undershirt. You would pull the button up shirt open with your weak hand, and remove the gun with your strong hand. Obviously this works far better for a right-hander. And it's a bit hard on your shirts. After the event is over you look like Bruce Banner after a rage session. I'll see if I can find that video link for you.
[EDIT] Well, I found the site that used to have some videos, and they're all gone now. It seems people realized it was lucrative to make videos of concealed carry draws and market for money: