Ads are a revenue stream mostly for the platform e.g. YouTube itself. You can have a look at this[1] or any other "how my YouTube channel makes money" video to see that's the case.
In-video ads, on the other hand, are indeed a significant revenue stream for creators, but those have nothing to do with the platform and everything to do with the single creator.
For smaller Youtubers (LTT is a very large channel) the gap between AdSense and in-video tends to be wider. I don't have hard data on this but it's the result of talking to several youtubers in person. If someone has the data, it would be cool to share it here.
Realistically I should be aiming to replace Google's revenue for my eyeball traffic, because that covers all of the costs as well. Still seems very doable.
It would be nice if Patreon partnered up with them and handled the transactions.
That's like 1-2 dollars worth of 'penny' donations per day. I'm not sure i would be willing to pay that, esp. if for videos that i'm only mildly interested in, and would not have gone to watch if it weren't free.
I doubt I skim through even 10 video a day. I think people like myself are more likely the norm than the exception.
A common "digital fallacy" people make is assuming 'everyone' uses a site like they use it. Most people don't.