Correct and then incorrect.
1) Correct that I have only bought stock (and never sold) since I started buying in 1989 (that's only 31 years going on 32, not 40 too, by the way). I ONLY buy stocks within mutual funds. I am extremely well diversified. I do NOT buy individual stocks.
2) Incorrect that it isn't very intelligent to do. The main reason to buy stocks is to be properly prepared for retirement. What I do and what everyone SHOULD do is earmark 15% minimum of their income to retirement accounts. If you want beyond that, you can buy some non-retirement mutual funds. With the rest of your income, you live your life, but you also do what you can to get rid of debt, and you plan to own your home outright by the time you retire. That's where I am. I have been able to retire for good for a few years now, and I have whittled my work week down to just 30 hours a week and may decide to be completely done in as little as a year and a half from now while still in my mid 50s. My wife is a college professor who wants to work until she is 60 or maybe as long as 62. We have zero debt and own our home outright, and we could live on the investments we made right now easily if we wanted to, but we're not yet ready to stop working. It is at least a little bit entertaining for us. It's actually more fun working a job when you actually don't have to anymore.