Don't know if anyone else has spotted this, but the way that ebay have restructured the display of bid histories makes it possible, in some circumstances, to know what someone's max bid is.
Previously, only the value of the current winning bid was shown before the end of an auction - and all the other bidders were shown, but the value of their bids was hidden until the end of the auction.
Now the value of all the bids is displayed as the auction progresses. Thus if you see an auction where the winning bidder has bid $50, and the value of the next bidder's bid is also $50 then you know that the maximum bid of the high bidder is $50!
If it were not then his bid would be automatically increased to the next increment. This can be very useful information to have in some circumstances .. so I just thought I would let you all know
Vroomfunkel