There are a few other things to consider here.
Firstly your minimum bid is based on both your historical clickthrough rates on that keyword and the global clickthrough rates of your entire account.
Secondly which Keyword Tool are you using? The one in the Tools section or the one Google provides when setting up an account.
These tools can produce different bid estimates -- as the one in the Tools section uses your Global clickthrough data, while the one within a campaign uses campaign clickthrough data.
The bottom line is you need to increase the clickthrough rate of your adds -- globally. This will definitely help with min bids.
Oh and one last note. Cheap keywords are usually cheap because they don't convert as well as expensive keywords.
Regards
David Tislini
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