Transaction fees are what kill this. That and moral police / "fraud" charge-backs caused by insufficient user authentication.

I also don't want to be nickle and dimed to death, given the transaction fees there's a huge push to subscriptions and other models. Where if I could instead just pay exactly what a generic ad I'd _never_ click on anyway pays to get placed (like 0.00001 dollars for all the ads on a webpage stuffed with them) I might actually pay instead of using adblock for all of the security, usability, and bandwidth saving reasons.

There have been many micropayments schemes over the years. IIRC, there was a decent one slightly cleverly called "Millicent" developed by DEC and pushed in the early Internet days... (Then there were the various pre-bitcoin internet banks/e-cash outfits - First Virtual, eGold, etc....)