A secondary income source can become more valuable than your primary income source.
Forbes reported that in 2015, Jordan raked in $100 million from his deals with brands such as Nike in a single year. For comparison, that far exceeds the $94 million Jordan collectively made over his 15-year career from his playing salary.
And there's no reason to limit yourself to just one or two "side hustles."
Real estate as an investment has the potential to backfire.
If you're going to invest in luxury real estate, be prepared to front some of the "invisible costs" of owning a mansion, which can easily run into the hundreds of thousands.
Business Insider's Katie Warren previously reported that the invisible costs of owning a mansion include much more than the expensive mortgage. Costs include high utility bills, landscaping maintenance, and smart-house systems.
As Business Insider's Cork Gaines reported, MJ is "still paying more than $100,000 in annual property taxes" along with the salaries of the full-time staff still occupying the property to keep it in pristine condition.
"It is estimated that Jordan has paid more than $680,000 in property taxes since he put the house up for sale," Gaines wrote.
Pouring too much money into customizing your dream home isn't always a good decision — especially when you try to put the house on the market.
Business Insider has previously reported on a number of celebrity houses that don't sell. The culprit is usually customization; Business Insider's Lina Batarags reported that customized houses — like Jordan's — can be hard to sell, as they include extremely personalized features that do not appeal to every buyer.
Jordan's Chicago home — which has been on the market for nearly seven years — features a gate and basketball court emblazoned with his name and number.
Big gambles can pay off, big time.