I agree with this point, but I think where it gets tricky (or interesting) is around variation in what people might see as the 'cost price' of such parts. I'd guess a number of people here would own modded speedies from back in the day where you could get a Mitsukoshi dial for $300 from Watchco and bolt it onto a $2000 donor watch. By contrast, newer collectors might reference a mod like this against current prices for speedies and the only ongoing online retail seller of the dial - who's currently asking 3999 GBP. I'm sure that calculation of the additive parts value is still there, but it feels like over time this might equate to beliefs that these are multi-thousand dollar upgrades.
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