I've been offered (and turned down) 6 figure salaries. Honestly (as mentioned in the article), the freedom from time-sheets, PTO, HR, rules, and regulations makes startup life a no-brainer for me.
And given more time, you can easily grow your business to be a 6 figure income. That is not uncommon.
Good work
And still do a startup on the side while you're at it... besides meeting future cofounders on the job.