It's important to note that there is a huge difference between grey market and vintage, yet you don't seem to differentiate between the two.
Yes, for a noob, buying vintage has numerous pitfalls, as even established dealers don't always disclose overpolishes, redialled frankens, and there is no substitute for research to make sure you know what you're getting. Because of this, buyers may mistakenly believe that any watch from a vintage dealer is 100% correct.
However, I don't quite understand your issue with grey market. If someone is offering a new Speedmaster for £400 quid, it's probably fake, but there are several well respected GMD's offering a good but realistic discount and there is no risk buying from them. As with any new item, it may have issues from the off and by buying grey, you may not have a factory warranty. However, as a full service is likely to be significantly less than the savings made when compared to buying from an AD, this is a saving that many consider worthwhile.
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