Is the severe shortage of stock levels of the iphone 4 a marketing ploy by Apple?

Do you think Apple have purposely not released enough stock of the new iphone 4 as a clever marketing scheme to whip people into a complete frenzy and hopefully increase publicity? Or have they genuinely just not manufactured enough stock, but surely they knew the demand would be massive, seems strange from such a huge successful company like Apple?
Your thoughts?
 
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