Power
Chances are you'll be as powerful as a mouse in a trap, as most people who try to break into fashion photography are about as powerless as it gets.
There are armies of people out there trying to do exactly the same thing. If you actually manage to score a shoot, beware of signing an unfavorable contract—and if you're just starting out, odds are the contracts you sign won't be great.
What does that make you? Powerless.
If you actually manage to carve out a place for yourself in the fashion photography world, however, you will find some power. You might not be as invincible as LeBron, but when you're on the set you're the boss. You design the shoot, so the buck stops with you. You tell the models how to contort their bodies, flash their pearly whites, or look sadly at a rotten apple or whatever.
But in the end, though, you still have to answer to your client. If they think a picture of a girl staring at a rotten apple is a bad way to sell perfume, your power trip might be over before it begins.