It sure looks like Mark Cuban is walking away from everything that made him Mark Cuban

• Billionaire Mark Cuban made a name for himself as a businessman and media personality.
• But he's now selling his majority stake in the Dallas Mavericks, per ESPN and the AP.
• So it could well be the end of an era for the Mark Cuban that we've come to know.

Billionaire Mark Cuban is many things — a serial entrepreneur who has dabbled in tech and pharmaceuticals, a reality TV star, and the longtime owner of the Dallas Mavericks.