Lot of folks roll their free cash into real estate or stocks. While it's good to reinvest in a working machine, it's also a sound idea to take some cash off the table and invest in uncorrelated assets. To learn more about uncorrelated assets, check out Ray Dalio, I'm a big fan:
https://www.youtube.com/watch?v=Nu4lHaSh7D4
I have a few venturers, adult and non-adult, plus real estate and stocks.