> If there were any significant number of people who would pay for a dumb high end TV, the market would sell them one.

I am not convinced of this. there is more recurring revenue involved in spying on people

There is a market and people pay for it. However they are mostly not TVs, but monitors and those paying for it have the budget to pay far more. However this market will always exist because some of those are showing safety messages in a factory and if the monitor in any way messes those up there will be large lawsuits.