How else do you expect YouTube to pay it's bills, by fucking magic?
More importantly, how do you expect the people actually making the content to keep paying their bills?
Since the fine folks on BARF don't seem to think there's content on YouTube worth a damn, here's five channels ABSOLUTELY worth your ad time: (as curated by myself: loads of science and maker content)
Kurzgesagt: In a Nutshell (Complex concepts explained simply)
[youtube]_27eD49ePQE[/youtube]
Clickspring: Machining and Amateur Clockmaking (Not as good as loumc, but he manages)
[youtube]dU7iKNmQBIs[/youtube]
Slowmo Guys: Fun with High-Speed Cameras
[youtube]np68FhljCb8[/youtube]
Jimmy DiResta: Woodworking, metalworking, creating in a number of mediums.
[youtube]WBYCLm_5KbI[/youtube]
Regular Car Reviews: Hilarious and insightful reviews of mundane cars
[youtube]VKYMgfjCd7E[/youtube]