It may be that the people bidding had been looking for that particular bowl and that money was not an object to them. Of course, the question then becomes, what about the bowl made it particularly desirable to them. Something I would have liked to see is a picture of the bowl without using flash. The flash makes the bowl look white, even though the glass is apparently clear. The mention of Dino Martens, coupled with the white appearance of the bowl, may have piqued interest.
BTW, I found a mention of Dino Martens designing a bowl for AVeM in Kovels last night -- a white bowl with color inclusions. Kovels is usually pretty careful, I believe, so it is one more piece of evidence that Martens worked some with AVeM. I wish there was a book that credited him with the designs that he did there.
Anita