Because a lot of people click on his video, promote it (whether in joking, what not to do or those that just don't have a clue), this is helping him get more views so more homeowners will think this is the right way to do things.
Videos like this is what is hurting the industry, damaging property and going to hurt your own business if you get into roof cleaning because you are promoting the wrong way to do things if you think about it. What do you say when you are trying to sell a soft washing roof cleaning job and the homeowner mentions this clown's video and how that is the right way to do the job......what do you say? Do you mention that you are promoting it to your friends in the industry so he gets more views so he has more credibility than you do?
Don't take this the wrong way, most of us don't like him and don't want to help him promote his wrong ways of doing things so we don't put his videos or links on the forums.