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Another reason is for fame but this is still second in the line to earning money in blogging. If you have a very informative blog reader will eventually look for the author and know more about him/her, this is for them to ask something or suggest ideas to the blogger.
And the third reason is for fun, some blogger just blog for personal amusement and a past time. But blogging can also be the best past time just because while you are enjoying you are earning money and making a name in the blogging and internet world.