If you underinvest in your Business - it impacts the business's ability to Grow (actually limits growth) and deteriorates the Culture of the company.
So continuous appropriate investment is Critical for long term sustainability.
Now apply that to your Personal life, arguably even more important than our Professional one.
"Generally speaking, investing in yourself is the best thing you can do. Anything that improves your own talents. Nobody can take that away from you."
No Investment, No Growth.
No Growth, No Sustainability.
Invest in the Effort.