But, HD Radio at least doubles their power bills,

No it doesn't.

requires on-going troubleshooting,

We have been running it trouble free for the last few years. Haven't had to
make a change or adjustment since the sign on.

and there are on-going fees to iBiquity.

Just like there are to ASCAP, BMI, Microsoft, etc., etc.

It's part of the cost of running a business.

i would think stations, as radio groups declare bankruptcy, will
eventually pull the plug.

You would be wrong. ;-)