Annoying buyers on Ebay, bid retractions

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So I have been selling on ebay for about a year now and throughout that time I have had quite a few non paying bidders which can get really annoying especially when you are dealing with it again and again. I now have a huge list of blocked bidders. Anyhow in this last week I have had three different people make bid retractions on my items. The first one was on a book I had placed at 99 cents. The bidder bid up to 1 buck then retracted the bid about an hour after placing it stating that they had entered the wrong amount. Now I thought that if you by mistake entered the wrong amount that you were suppose to bid again entering the right amount. What i also dont see is how can 1 dollar be the wrong amount its not like they entered 100 by mistake. I think they just were playing around or decided they didnt want the item. The second was on a plush toy. Now this buyer actually wrote to me just about 10 minutes after placing the bid with a message saying simple "cancel my bid". I told them to go put in a bid retraction form if they want to cancel it. Which they ended up doing. They are now no longer a registered user. Hmm....I wonder why. The last one was today. This person bid on a plush toy and then wrote to me saying that they hadnt realized what the shipping was and no longer wanted the item. I once again told this buyer to put in a bid retraction form if they want to cancel. They have not yet done so though. I just dont get why a person would not read the whole ad before bidding. i mean wouldnt you read the shipping before you bid. Now i can understand this happening once in awile but three times in a week. Makes me fed up with it!! Has anyone else gone through this before?