Hard to spend $80 million when the feds have it and you're in jail.

Plus, this new system would involve no central entity taking a cut.

It's a lot easier to evade the Fed's if you live in Africa or middle east. Just saying but you could easily setup those operation outside of US in a much "harder" to get caught. And if you bounce around every now and then to different countries you're pretty much guaranteed not to get caught at least for a good number of years.

I imagine that prisons are largely filled with people who felt they we're "pretty much guaranteed not to get caught at least for a good number of years."

(Even if they remember to destroy their inscribed copies of 'Leaves of Grass')

Right up until the Feds drop a tip to said African or Middle Eastern country, after all, those countries are known for their drug tolerance and their human rights.