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You're absolutely right. My point is simply that a price which might seem outrageous for us can still be a market price as long as there is a market for it :) Also consider opportunity costs, if you make 1k an hour (who doesn't, I know...) you'd rather pay a bit more for a frame than spending hours on the interwebz searching for a frame with a lower price. That is why People with too much Money often pay seemingly unproportional additional fees for Service/peace of mind/less hassle or whatever you wanna call it.
Shops do have to make a profit and they tend to sell to people who haven't much knowledge of frames and are attracted only by the looks of a bike.
There are collectors who also think the more something costs, the better it is and they have the means to buy at those prices.
If I was a bike shop I'd have to probably close within months of opening it as I'd never oversell to anyone.