Blackmail.....apparently he had the tapes for the blackmail of all who visited his estates.
He most likely kept videos and tapes for protection instead of blackmail. If any of his "friends" decided to turn on him...he had something to make them think twice about it.
If he was in the business I think he was in (brokering dirty money), it was the kind of business you don't retire from...and you need a lot of protection to make sure your associates don't think of retiring either.