That is not entirely true. For example... if you place a bid of $25.02, following which someone bids $25.00, you will be winning the auction with the current high bid amount of $25.02.

If you then decide to increase your maximum bid amount to $30.00, you will still have the current high bid, but the amount will jump from $25.02 to $26.00 - one full bid increment from the other bidder's maximum.