It's kind of hard to say how many shills are on this forum. There's several different organizations. Myself, I'm employed by the American West Coast Society of Misinformation, which for some reason falls under the authority of the IBEW. The safety regulations can be onerous but the benefits are good and it at least is a secular shill organization.
My previous employer, The Imperial Order of Information Management for His Satanic Majesty, was as the name implies an organization with some religious over tones. Our meetings were opened with prayer which made me feel uncomfortable. All of our holidays were different. And, I know this is an odd complaint, the people were way too nice. Like Mormon levels of politeness, it's kind of annoying.
A fascination with the sphere shape was pervasive throughout both employers. We have direct deposit now but before that we used to get our paychecks were round. About the size of a tennis ball. Fun fact, breast implants are based on NASA technology. A good test for determining of if someone claiming to believe in a flat earth is actually a shill is see if he responds to large breasted women. 99.9% if a man is ogling large breasts, he's a rounder.
I don't know the exactly number but I'd say in North America some 280 million people are paid shills. That might change with our next president. I'm not sure how yet.