The problem for most people, especially if they have a job that pays them well, is that they adjust their lifestyles to their salary. So when you're in your 40's, you're making a couple hundred k and you realise you want to look for more job satisfaction, you find that you're unable to wean yourself off the money.
As investors, once the portfolio builds up, we can replace our income with rent, asset sales and redevelopment income. Too many people (I hear it enough from my colleagues and friends) are stuck at their jobs because they can't afford to be without them.
Those on high incomes are especially trapped: high incomes usually comes from specialisation. The more specialised you are, the harder it is to change jobs. For myself, I'm an accountant in a bank. Even now I'm a bit too specialised to change jobs without taking a big cut in salary. My own plan is to just continue at my job, get as much money (and what little satisfaction) as I can get out of it, and in time replace my income using the property portfolio.
Without an alternative, especially if you're making a high salary and living to that level, it's unrealistic to just say you will take a pay cut for the job satisfaction.
Alex