Yes, and if you are rational, and enter your real
maximum bid, you will lose
the auction to someone who bids higher than your maximum. If you go back
later and change your maximum, then I would consider that irrational.
I wouldn't, under one specific case (which is about the only time I do
increase my maximum bid). That is when I've found out more about the item
on sale and think it is actually worth more to me that I've already bid.
Then I will enter a higher bif whether or not I've already been outbid
(or for that matter whether or not anyone else has bid at all).
Ans yes, that's how I normally act on E-bay. If I see something I am
interested in, I enter a maximum bid of what it's worth to me. If
somebody outbids me, fine, they're prepared to pay more for it. And I
don't increase my maximum bid even if there are still days to go.
-tony