Agreed it does depend on the content and advertisers.I know it was about $1k years ago but due to changes most have moans about the advertising rates and presumed it would be more like $300 per million now but probably varies on content/advertising
socialblade.com gives you a rough idea of what these creators can make.
All i need now is a Cat, Some Toys to unwrap and the back ground song Baby Shark (ill have the fast car bit soon)