I think he meant don't invest in others businesses, start your own. Depends on whether you're good with money and bookkeeping, etc I suppose.
Yeah indeed starting your own business isn't a easy thing which you can do in one two three, you need knowledge for it and a capital aswell.
I wouldn't start my own business, way too much working hours and risk for me to be worth it but ofcourse you could live very wealthy if you succeed.
you forget the fun...
I have much work and fun running my u2 system.
My members have just fun...and profit.