Male Baldness Info

Like everyone else, I get the spam emails about enlarging your male member. Of course most of us aren’t stupid enough (or insecure enough) to fall for these ads. But the other day I had the thought that maybe the chief reason penis enlargement treatments are a kind of modern snake oil, like baldness remedies, is that penis size may simply be related to a person’s height and body proportions. Thus it would be unchangeable.
A person could no more “grow” their penis than they could grow their feet. Your foot size is your foot size, no matter how much you might wish differently. And foot size (and maybe penis size) is related to your height. Taller men generally have larger feet. Thus it stands to reason that taller men also have larger penises. Nature keeps our body proportional. You can’t expect to see an eight inch penis on a man who only stands about 5’4″. However, on a man 6’4″, an eight inch penis would be proportionate to his body.
Are there any flaws in that logic? Or have I put too much thought into this?!