Please, do share a “number” of sources, that was my question: where are you getting the info you’re using to speculate? From my own sources (Google search), it seems like you might be exaggerating.

What is your point is about the YT revenue vs the repair revenue? Why do you assume they’re separate things? Maybe the YT channel is marketing for the repair business, and both operate as a single entity? Highly monetized YT channels frequently require a staff to maintain, to do filming and editing, writing and research, marketing and SEO, not to mention the time investment to produce a lot of content. How do you know what’s involved behind the scenes of this particular channel? Why are you certain the expenses are negligible and don’t involve employees? People just baselessly assuming YT vids are easy and cheap is one of the reasons so few people make money on YT, and so many people share myths about who’s getting lucky and by how much.