Do you know that you have to spend 1$ for every correction in card detail?

Just lost 3$ changing my account details in itunes store!! and the support page says

"The iTunes Store will place a minimal authorization hold on your credit card each time that you update your account information (equal to around 1 USD or your local currency equivalent). The authorization hold isn't a charge. The authorization hold is placed on your credit card to make sure that the information provided matches the information on file with your financial institution. The authorization hold won't appear in your iTunes Store purchase history."

What does this mean? I will loose 1 $ every time I make a change? is it a refundable amount? I didt knew this till i got the alert form bank. There was no warning message from the site either that I am going to loose 1$.