Lol thats a lunatics take. You absolutely can be expected to pay every person who gives you content to farm users off of.
Imagine applying your take to any other business. “Sorry john, I loved the soap, but you only have 4 people a week asking about you, so Im going to be keeping it for free.”
“Love the scarf, really, but you only sold what, 25 this year? 50? Nah, Im just going to keep this. Let me now when you shift real sales, maybe then you will deserve being paid.”