Unbelievable sale of flags at Sotheby's

[Meister]

Then view the results in the case of Russian auctions, and came to the auction, which sold 4 of the American revolutionary flag of 1779-1980 period. And despite the fact that two of them were sold, the remaining two left. The most important thing is the price for which they had left: one for 12,3 million U.S. (4 times above the estimate, Fig. 1), second in 5 million (within the estimate, Figure 2).
It should be noted that this was 2 years ago.

Are the flags really can cost so much ?????