Pre-owned vs grey market question

I was searching but couldn't find the answer. 

Why are pre owned watches, even older ones, more expensive than the grey markey sites?

I know there is the warranty, but is that it? Because the cost differences are sometimes dramatic. Are there folks who refuse to buy grey market? 

Reply
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It's because their available to purchase now no waiting lists 

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Oldmanwatches

It's because their available to purchase now no waiting lists 

but grey market sites like Jomashop, it is available immediately, new, and still cheaper than the used watch.