*"What a massive waste of time and money."
*
Not really though. The YouTube video has been viewed 3.7 million times since it was put up on the 30th Jan.
The revenue that he will have received from that is almost certainly already more than he paid out to set it up.
And thats before taking into account revenue made from future views on that video, and from future views of other videos from the 60,000 new people who have subscribed to his channel in the last 3 days.
YouTube is incredibly lucrative. People will pay out big money if they know their content will make them even bigger money in return.
And pranking someone as vile and hated as KH was always going to get views.