I had one of my wife's relatives in 2013 tell me "I'd never buy Amazon stock. They've been in business for 15 years and still are not profitable!" I tried to explain that it's because every dollar of potential profit was funneled back into R&D and company expansion, and that revenue has been growing steadily, but he just didn't get it.

If he'd bought stock then, he'd have ~10x'd his money in that time, whereas the S&P500 has ~3x'd.

I would have bought stock myself back then, but I was a broke college student.