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 musicbid.co.cc

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.