A lot if they play their cards right as consultant.

Still not seeing dollar amounts.

I think most will struggle compared to a 6 figure salaried developer consistently bringing in paychecks.

Adam Wathan is a great example because he has shared details along the way.

His last php course I think he made 300k+. His latest css framework by my calculations netted him over a million.

His in previous refactoring to collections I think he made between 100-150k.

He recently down turn off all ads on his radioshow because he doesn't need the money.

Taylor Otwell has made millions from laravel ecosystem saas type sites.

Jeffrey Way doesn't disclose figured but based on user count and monthly revenue he must be pulling in at least 500k.

It's out there if you want it. Start a radio show, get opinionated, sell others on your vision. Then offer products to support your new vision.