For me this is not a good way to look at it.

As a listener, if the podcast is valuable to me, I don't care if it has 10 listeners or 10000. Maybe what makes it valuable for me makes it useless for others. The idea for v4v is to reward the value, not to think about the cost.

It's the same with how I do pricing. I don't look at my costs. I look at the value I create. Cost of production as the basis of value is a marxist fallacy.

For example my podcast has probably less than 1000 listeners and I want to keep it that way. I can serve my listeners extremely well. There's no need to push it further. I just need to make sure they realize they're getting something more than if they played a mainstream podcast that is not perfect for them.

I think the only thing that should go to your calculation about sats per minute and especially boosts is what value you receive from the podcast. Their costs and other listeners don't matter.