I am pretty sure he pays people to go through a list of numbers and call them to tell them how awesome they are.

At 1 call per minute (which I figure is pretty liberal for a "Hey, have you finished your shit yet?") a single person can clear 400 people per day easily.

But of course if you paid someone $10/hr to call people, your sweet spot for break even is somewhere around 350 customers before you hire someone.