My YouTube back-catalog nets me $2-5k each year. One video in particular has repeatedly paid for my children's Chirstmas presents as it tends to "go hot" around this time of year.
I have a "dear diary" type series that I do every weekday. I have uploaded 433 episodes on that series and it generates nearly no views. It's not the type of content people look for on YouTube.
Bisquit is similar I guess, in that he picks super obscure topics that interest him and vlogs about it. Lots of programming, but also a ton of esoteric Christianity, folk dancing, etc. Interesting guy.