All valid concerns and probably how this will continue to go.  Though there is some element of chance or difficulty in knowing exactly what will happen.  I am continuing on with the equipment I have and while it's a fun deal and would be great to build more rigs I have a lack of optimism in the future.  Taking a wait and see approach.

Regardless ROI is even worse if you pay your taxes.  Income and then capital gains for mining/selling takes a big chunk out of anything you earn.  People can frequently get away with not claiming anything on their returns however there is no reason to expect getting away with that will get any easier.  If anything it will be harder.