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Why does it have to be so hard? - Most directories still have a very complicated registration process, with businesses having to fill out page after page of information. A complicated registration process is not a good introduction to an online business directory with many businesses just pulling out half way through registering.
The Shotgun Approach to marketing - Businesses typically register with many different free directories without much thought as to what one is the right one - some just choosing a directory on its looks! Apart from the time they wasted creating their listing on a business directory that is not going to be of any benefit to them and some directories may employ hard sales tactics after you've registered.