eBay and Craigslist finds

well if you bid £51.01, and the current *highest *bid is £50.00 then the £1.01 increase should make you the highest bidder.
That's why i think it would make a difference.

(i understand the example given for the frame in question is unrealistic)

But even if you bid £100 and the next highest bidder had bid £50 and it ends like that, you'll win it for £51, not £100.