Why do people on youtube trick people into watching there videos and then it shows never gonna give you up?

It's a prank termed " You enjoy been Rick Roll'd or Rick Rolled". The poster gets a impression of accomplishment and satisfaction knowing that they have duped someone into spy the Rick Astley music video instead of the video they really wanted on view. The more people they scam on fool, the and accomplished they feel, but it's a total inefficiency of internet bandwidth and resources on the occasion that you ask me. Rather like chain kite are, they clog up the internet also slows up the transfer of everything.