how relaible is Google adwords keyword checker

Is Google adwords keyword checker relaible? If this is the question then let me answer that it is not because I can prove practically or experimentally because
I have a blog
According to the tool the word musicbid is searched 8100 times a month globally which means I should get more than 200 visitor to my blog searching for musicbid
Unfortunately there are 2 3 visitors searching for musicbid in internet who come to my blog which is in top for that keyword.

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