John G;65766 wrote:Hope that explains it

It doesn't need explaining.
If an item is currently at £20 and you want to bid on it, you might place a high bid of, say £60, thinking that gives you plenty of scope to stay in the game.
If someone bids £70 and the price now goes up to £62, ebay emails you to let you know. You then have the chance to increase your maximum bid. You may reconsider your original bid, and bid £80. The price is now £72.
This repeats until the end of the auction.
Until you get to the sniper.
You see the item at £20 and you place your high bid of £60. No one else bids. You think you've done enough. The last second clocks down, and you're sniped for £62. Ebay emails you to recommend increasing your bid, but now there is no time. The auction is over. You have no chance to reconsider.
So, next time, you remember that you lost the auction for the sake of £2. You see the item again, starting at £20. This time you decide to place a higher maximum bid of £80. No one else bids. You think you've done enough. The last second clocks down, and this time you're sniped for £82. You still can't place a higher bid, regardless of ebay's "you're outbid" email reminding you to "not let it get away" because the auction is over.
The next time, you may place a maximum bid for £100 - but then you'll be sniped for £102.
With sniping, it doesn't matter what your maximum bid is because you'll be sniped by one bid no matter what you put in - unless you put in something so ridiculously high that you're paying more than you would if you bought it new (I've seen some sniped auctions in which the final price is more than the "new" price would have been). In either case, there is just no point bidding on an ebay auction.