Even though it is true YouTube is a hugely valuable resource, if it takes YouTube going as far as blocking adblockers for me to pay for premium at this point, I don't think I could bring myself to do it. In a word - and I know it sounds like a cop-out to say this - it feels like capitulation. Letting up on blocking ads on YouTube would not make me give up uBlock Origin for
all other websites, and I think that would cause me to have a lot of cognitive dissonance in my decision. It's an issue of conflicting mental signals and the mood that results from the resulting implication - it's like saying "ads are not okay under any circumstance - until they start locking the doors."
I feel like it could be the same for a lot of people who can afford the cost. Ability to pay may not always be the issue. Paying the price could become a symbolic indicator of Google finally triumphing over even the most obstinate anti-timewasting user, and mentally it's not a good feeling to give that up that fight after years and years of holding on to the adblocking creed, regardless of the resulting betterment of the service from paying.
At the same time, it doesn't result in a justification for being set in one's ways, only a possible explanation of why people would decide not to use premium. This strategy only works so long as uBlock Origin's team of volunteers holds more patience than Google's salaried employees.