Come on, GE. I can think of two.
Reason #1: You get to tell your friends and post on Facebook and FReeRepublic that you got the vax and that you're better than everybody else.
Reason #2: Uncle Sugar MAY allow you to move about freely. If he's in a good mood.

I get to tell everyone that contrary to my previous statements, I have unwisely relented and taken the poisonous vax-which makes me stupider that people who didn’t take it.
And uncle sugar will use it to track me and stop me from going to places I like such as FReeRepublic Q thread.
So no I don’t think theres any desirable reason to get that bad vax that ain’t a real vax.
They can find another guinea pig to experiment on. I decline to participate.