I’m guessing the population aware of and interested in ad blocking and the population willing to half ass it in Brave is very slim indeed. I suspect that a majority who have become motivated to use an ad blocker and especially a script blocker have no patience left for any incarnation of advertising, regardless of fractional “rewards” on offer.
Your negativity aside, the test has not been run to completion where it matters, in the market. I keep noping out of YouTube Red or TV or whatever it's called, because Brave blocks all ads there and (with forthcoming work to enable playback controls in various settings including cars) easily beats the pretty-terrible YouTube mobile app.
The idea of charging for Brave that you lead with occurred to us, but browsers and even non-corrupt ad blockers are free, so it looks like a high hill to climb. Perhaps with the slicker video controls and integration work, but anyway, glad we got past the assertion about "miniscule" revenue to users. In my experience, paying users beats charging them :-D.