Mark Cuban.Amanda Stronza/SXSW Conference & Festivals via Getty ImagesIf you're going to pitch to Mark Cuban, you better do it by email.Cuban said in his MasterClass course that he's "literally invested $100 million in email pitches.""Some of them, I still have not met the people," Cuban said.It turns out you can still pitch to billionaire Mark Cuban even if you don't get invited to go on Shark Tank."For me, I'm always accessible via email.