Thus, a shipbuilder and Watergate bit player named George Steinbrenner could take over the Yankees and turn himself into The Boss. By buying a team, an owner can reveal their inner winner - or make people forget how they made all that money in the first place.
If you happen to have the billions it takes to acquire one, you presumably have a near-infinite number of ways to spend your money.
To its owner, a sports team is more than just a plaything.