Good thing the structure of licensing law also makes it impossible to in any way aggregate such blogs into a larger more user-friendly thing.

Also, I don’t think this model actually “scales” in the way you describe — it’s still succeeding because it’s under the radar; while Dave’s traffic might be mighty to mortals like you or me, if it was ever so widely read as to make so much as a minor mark in the wider music marketplace, those verbal rockstar-to-rockstar agreements wouldn’t be worth the electronic bong greeting card that was passed between them.