There's some truth to this. I've been involved in media buying on instagram for over a year now (basically buying shoutouts from bigger accounts, but sometimes I'll have those big accounts "like" photos or follow my account b/c it's cheaper than a shoutout and can help gain followers). I've spoken to a few guys that hack accounts or have had their accounts hacked. The shyt is a dirty game. It ain't just regular hackers that are selling their accounts too. Celebrities (or has been celebrities) and friends of celebrities sell their accounts all the time. I know One of Justin Beiber's friends (I think his name is Ryan) does this. He sold his twitter account that had 300k-500k followers to some online clothing company.