At today's exchange rate of ~800 USD/BTC, this is 0.7 cents.

Thanks.

For a standard implementation, the size is closer to 250 bytes, so 50 times higher. That means 35 cents.

Was intending to answer this:

How low do you think they would go?

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* "cost" is in quotations because it's not really a cost per se, but a reduction in expected revenue

It is a cost that should be accounted for.

Sure, of course. I just like to be precise, as it has implications when thinking about collective miner strategies. Not relevant here though.