It depends on what the OP wants to do at HBO (Creative, Production, Marketing, Finance, etc?). Every company at the end of the day is a business which is where an MBA can come into play. If you do a simple google search of “HBO linkedin MBA” you will find plenty of current employees with MBAs and their respective positions. Find out whether or not what you want to do at HBO falls in line with education and network you would receive by pursuing a graduate degree.