I don't think it relies on that assumption... I'm assuming there's a power law, but the total amplitude is arbitrary depending on how popular your interest is. Sure the level starts higher for "normie" interests -- food, sports, gardening, politics, Jaysus, etc -- i.e. the things people talk about on Nostr other than Bitcoin. It's the reason why when I talk about pinball or urbanism it gets zero engagement because those are relatively tiny communities and there's statistically "0" people here who care. Having a more or less popular interest just moves the curve up or down, it doesn't change the nature of the argument.