Yes, but, as has already been said, I think a determined and unlimited-funds buyer can draw a few up the ladder with him/her. I know that I went a few bids beyond my own good reasoning, and I wasn’t overly desperate (I have a 1567), or can say that I had the money to spend.
I believe it can definitely drive the prices up if someone decides they want an amazing Elizabethan collection, and sets out to buy all the nice pieces for a year or two, until perhaps they get bored?