Bruce Simpson, well known for his RCModelReviews and his XJet channels, makes 100% of his living off of YouTube and Patreon. Both income sources are critical to him and without either he'd be in a tight spot. There is one income source, though, that would exceed both of them together and that is affiliate links. However, Bruce has stood on the principle that he doesn't want a hint of anyone questioning his integrity. As a result, he foregoes all affiliate income.

You can find my Patreon here:
https://www.patreon.com/michaelrollins

You can find Bruce here:
https://www.youtube.com/user/xjet
https://www.youtube.com/user/RCModelReviews