Youtube earning estimate I heard

I heard that a youtuber, that is someone with their own channel and ads enabled, made about 10,000 dollars a month from about 600,000 subscribers.  They said that the same youtuber also made an additional 10,000 a month from promoting their own products.

Checking on google to see other comments related to this I saw the following on quora

"If you’re starting a career on YouTube, or have taken an interest in building up your brand on the site, these are crucial points for anyone looking to build enough of a following to make money. "
 https://www.quora.com/How-much-does-YouTube-pay-per-subscriber

From the numbers on quora it suggest that it might be lower about 1000$ per month 600,000 subscribers.   Though I guess that might also depend on views, if lots of views are being constantly generated the higher estimate may be possible.