Is there any proof that a $1,000 bottle of wine is a good wine? The other day, I was in a specialty wine store and noticed several bottles of wines priced between $500 and $5,000!

Is there any way of knowing (historically or otherwise) that a particular exorbitantly priced bottle of wine is a well flavored wine? Or is this simply a marketing strategy?
There are many wines which are for sale at many thousands of pounds/dollars that no-one will ever drink, and that are not expected to have a good taste at all - they are simply priced there through scarcity.

A rare item is going to demand a higher price from an interested buyer than a commodity item.

While I may be able to tell the difference between a £10 bottle and a £200 bottle, I may in many cases prefer the £10 (and this has proved to be the case often enough that when I used to sell wines I used to sell based on what the customer liked previously, Not some description of the nose and palate that is upwards of 50% subjective and arbitrary)

Upwards of £200 there is almost no quality/taste difference, and upwards of £1000 the customer is solely paying for exclusivity, and the opportunity to drink or offer a glass no-one else can, or just to hold it as an investment.