Really cool addition, and very relevant to much of the discussions taking place post HF 21/22.
I think it would be 1 step cooler with a tribe that instead of burning a tokens, would add those used to buy ad-space to the reward pool of the suers who choose to display ads. Thus you give people a reason to want to see ads, and only they get the value benefit. But mroe importantly, it would mean that one could have a reward pool without the need for inflation, and create direct incentives for users to make the site/tribe more attractive to advertise on (aka increase the number of users and their engagement) because that directly affects the size of their reward pool.
I would fully agree with you. I believe that a positive, incentive-based approach is the most effective and productive way to give people a reason to want to see ads.