That was possible 30 years ago. There have been probably been a dozen schemes that tried something like that over the decades, starting with DigiCash from before the WWW existed.
They all failed not because of fees, not because of security concerns, but because even having to think about whether you want to pay for something and how much incurs a mental cost that people avoid.
Free beets cheap by a margin that has nothing to do with how cheap or how easy.
