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Another data point: Before all the smart TV stuff you would tend to pay significantly more for an A/V monitor (basically a TV without the tuner) than you would for a regular TV.

Both statements are true. As a baseline it's good to consider the price of the regular TV's before they got smart.

You do also pay a premium because they use use panels designed for 24/7 operation, sunlight readability etc.

When talking about digital signage in particular, it's clearly a premium because it's such a big price difference. A discount for the bullshit would be much smaller.