I guess it depends more on the niche than I assumed. I follow a lot of electronics channels, and YouTubers like techmoan and bigclive make $2,000+/mo on Patreon.

On the more extreme end of the spectrum, CGPGrey is making ~$20000/video on Patreon [0]

[0] https://www.patreon.com/cgpgrey

Beware, it's a power-law thing. I'm in the top 3.5% of all Patreon myself, and I'm barely making $650 a month from it. It's really dangerous to consider that as any more plausible than YouTube ad revenue: everything about it is set up as just another lottery ticket. I've been keeping track of the numbers for a year. The amount that constitutes the '1%' mark has been steadily declining even as the total population grows.

With Patreon, it's more properly considered as just another payment processor: the hope is that you'll build a functioning business and use it to handle people's credit card interactions.

Apparently (according to one YouTube channel I watch) the $/video figure is rather misleading as it doesn't take into account people's monthly spend caps.

So while CGPGrey might be making $20k/video for the first video, anyone with a (say) $5/month cap that paid $5 for the first video now pays nothing towards any videos released later in the month, potentially dropping the income substantially as more and more spending caps are hit as the month rolls on.

Heck even Mr Carlson's lab is making nearly $4,000/mo! https://www.patreon.com/MrCarlsonsLab