Mark Cuban reveals why he left Shark Tank and sold the Dallas Mavericks “When you start feeling your own mortality and you start recognizing what's important, my kids, my family, that next business trip didn't seem nearly as important as it used to” “Missing a birthday and telling myself, well, I'll be there for the next one, became a mistake” “I was just like what's the point of doing this?” “They were 13, 16 and 19 when I sold the Mavs and a little bit older when I got out of Shark Tank” “It wasn't going to be all that long till they were on their own and I just wanted to be there as much as I could”