All good points so far.
There ARE tons of people who absolutely positively are going to bid solely at the end, and they somehow forget, and sometimes those items go high anyway, but sometimes they go under (a few times WAY under) what those people were planning on bidding, and often it is an early bidder who ends up with it, so THIS is indeed the biggest advantage to bidding early.
The biggest disadvantage? You may give someone else valuable information about how high to bid. Say a $300 item was at $50 with a day to go, The novice might bid $100, thinking he was doubling the bid, not knowing there are several people planning on bidding $200 or more. His $100 bid is blown away, and he loses, whereas if the other bidder had bid $200 early, then the newb might have seen his $100 outbid, and then kept on chipping away until he got to $205.
But this means far more on eBay! There, you can bid with seconds to go, and the newb never knows what hit him. But in our auctions, even if you wait until 5 minutes to go to bid, then he stills gets to see if he is outbid, but of course ONLY if he too is at his computer with 5 minutes to go, which is a big IF. If he is not there, he gets outbid.
I will write more when I have more time, but the optimum strategy (in a perfect world, where you never forget, and where you have two hours to watch the auctions end, and where you can juggle multiple windows if there are more than one item that interests you) is this:
Be available when the items that interest you close, and have each one open in a separate window.
When the first item has exactly 5 minutes left, outbid your opponent by the least needed (you can make many small raises if need be).
Once you have the high bid, then if 5 minutes goes by without a bid, it's yours. If you are outbid, YOU have five minutes to get another bid in.
The advantage of this is that the other bidders MUST be at their computers too (or have left high bids that outbid your best bid) to outbid you, and since you are always just barely beating your opposition, you never need worry about someone "running you up".
I will wait to see what else is posted here and then post more later.
Bruce