How does this follow? He has developed a following around posting these types of videos which seems like a pretty sweet incentive for making them.
Not to say he's being dishonest or something, it just seems like a stretch to say that some random repair guy somehow has more to gain by (A) hoping 0.000001% more people buy Apple products by forgoing these videos so that he can repair a few more Macbooks than by (B) making these popular videos that net him subscribers and attention.