You can easily get (far more than) 15% return over a long period basically risk free by buying the S&P500, so it appears that you are the one who is out of touch with reality.
The long run return on the S&P500 is more like 8%, not 15%.
I probably should have clarified that I meant yearly gains, I can see how that can be confusing to read for someone that doesn't spend time on these topics.
And the expected returns going forward from here are meh. Stocks are expensive because they were valued in a 1% interest rate environment and given current inflation that probably won't last.