Been regularly putting around 20% of my income into long term and short term investments since 1980. Best money I ever used.
Spread the money around in investments outside the business since 1988, in case the shit hit the fan and it collapsed. Good years it was higher. Now I can sit back and live off of the investments. Actually have more money in the bank than we had this time last year, turned into even a bigger miser.
As for investing in the business, that was required as a month to month thing. Needed to invest in shoots that paid back in a 6-18 months time. Kept money on the side, for when a real money maker was found.