You don't have to sit and wait for the last few seconds of the auction to win an item. I win almost everything I bid on and this is what i do...
I ask myself what is the HIGHEST AMOUNT I am willing to pay for that item. If the most I am willing to pay is $30 then that is what I bid, $30. If nobody else comes along and bids then I get it for the opening bid which may be $3.00. If someone swoops in at the last minute and their highest bid is MORE THAN $30 then they can have the item. They went above my highest price I was willing to pay. . .
Things aren't always a bargain on Ebay. Some ppl are so dead set on winning at all costs that they sometimes pay a lot more than the item is actually worth just to say they WON the auction.
Just because you are willing to pay $30 for an item doesn't mean you HAVE to pay that. You could only have to pay $18 if there aren't a lot of bidders in what is called a BIDDING FRENZY. That
unnecessarily jacks up the price for the winner.
Sometimes I have watched 3 different auctions for the SAME item, same condition, sometimes even same Seller.
For some stupid reason, people see 9 bids on the second auction scheduled, they all start piling on and bid on that one auction. 17 bids later, the winner pays $29.
Meanwhile, the first auction scheduled only 20 minutes earlier than the second auction, may only have 4 bid at the start & end with 9 bids. The item goes for $20.
The third auction that only had 2 starting bids and ended with 4 bidders, the item goes for $15.
You'd think that if the second auction has 17 bidders, then they would have tried for the first auction first, then moved to the second auction 20 minutes later, and 15 would go to the third auction. EBay doesn't work like that. There is a concept called Bidders psychology. When people see many bids or bidders on one auction, they pile on and raise the price
only because someone else wants it.
I've even seen crazy people bid on a $50 gift card to some stores and 26 bid later, the winning bid is $62!!!

Most $50 gift cards sell for $35-$37 when there isn't a bidding frenzy.
Then there is something called SHILL BIDDERS who purposely bid to jack up the price. They are usually in cahoots with the the Seller, and purposely place early phony bids, to jack up the demand for the item and therefore jack up the price so the Seller gets more money.
Some of these shill bidders purposely bid really on an item, win the current highest bid, then retract their bid. What they are doing is revealing the next highest (real) bid. It shows up on the bid history. The real current bid, your bid, before the phony bid was placed was at $21. If your highest bid is $30, and they place a phony bid of $50, then retract their bid, your $30 bid gets revealed and put in the bid history, after a higher bid was placed. They retract their bid. Your bid of $21 gets reinstated. BUT, mere seconds before the end of the auction which looks like you will win at $21, "someone" comes along, usually the Seller's second friend, who has no intention of winning, bids $29.50, and you end up winning the auction for $30 instead of $21.
You may be willing to pay the full $30. And yes, if I bid that amount, I am too. But, if I don't have to, I'm not going to do things that may unnecessarily raise the final price that I have to pay when I win. I rarely have paid the full amount of what I bid.