I did and I have. Around $2.3 million in saved wealth outside of SEP'S, 401.K's, etc already saved.
How America's mindset has changed when not depending on somebody else for your old age or early retirement is considered "not planning well".
You should easily be able to generate $250,000 per year and even plug some of that back into your starting capital to do very well. Not all of what you spend out of that amount will be taxed in any event - but that's up to you.