How rich are web developers?

is a web developer a millionaire or billionaire,in other words can a web developer easily afford a new Rolls Royce phantom 2009(can a web developer have $500k has a mare pocket cash)
if no which set of people can (by careers/occupations and earnings).

if possible which set of people earn nothing less than $1m per month/ $1b per year

I’m a web developer and I make $1M a month. But that’s not the same as $1B per year.