Well ebay is not like that, so if you want to play by some other rules and not the rules of ebay then you'll be at disadvantage. Your choice, really.
Even in live auctions there is a deadline, typically nobody will give you 2 weeks consideration whether you'd like to pay a bit more. At some point of time there are no more bids accepted and the item has new owner. Ebay tells you ahead of time when that will happen, some online auctions do it 5 minutes after the last bid, in live auctions it's up to the subjective determination of the person who is conducting the auction...
Personally, I place a bid when I want to get that item for the amount of the bid, or less. So (1) if there is a strategy that increases chances of accomplishing the goal, I would use it (2) if something can allow my commitment to change if I change my mind, I would use that too.
(3) everybody else can do as they please, my only concern with what they do is to the extent that it could affect my strategy due to the previous two points.