Truth be told, these days it's more synonymous with real estate than cars. But the Lions, operating with zero debt in a highly leverageable position are their real bread and butter.
With the operating money they can get from using the team for capital, they could buy the entire city of Detroit. That's where the real money is, in letting banks give you more money than you would ever need by leveraging your assets.
And the Ford family does that better than any family in football.
The tax hit from selling would be insane. I have no idea, honestly, what Mr. Ford bought the team for, but on the high side in the era he bought it, let's say 3 million dollars.
Capital gains on that is going to allow for a 10% annual appreciation, so over the course of 60 years, it would be 600% the return value before taxes. That's $18Mm.
Anything above that is going to be subject to the highest taxes in the land. If they sold for a billion, which would be low for an NFL team now, they would be paying the 70% upper threshold on every dollar between the appreciated value of $18MM and 1 billion, meaning they would take a HUGE bath.
If the kids mortgage the team for even $100Mm after Martha's eventual passing, it resets the capital gains based on market value, and when the family sells it off, they can sell of for even more, without the huge tax hit.
Tax lawyers are damned good at what they do, but for a first generation inheritance on a second generation owner, you just can't hide that. Uncle Sugar wants his cheddar, and he wants it now, and there's just no real breaks they can get.
They are much better off leveraging than selling based on the original value of the team vs. the current market value and the tax percentages.