The reason I say that is because so many people are leaving money on the table for taking the Google Keyword Tool data as Gospel.
Let me explain...
If the Google Keyword Tool told you that there were no monthly searches for a particular keyword in your niche, I bet penny to pound most of you wouldn't bother purusing it further.
Instead, you look for searches of 1000+ at least.
Oddly, I was looking at my analytics for one of my Amazon sites and noticed traffic from certain keywords that I wasn't targeting.
So, I checked these keywords against the Google Keyword Tool just for curiosity and found that the tool showed "-" for monthly searches.
So I did a test site. I registered a domain name and picked 10 products from Amazon that the Keyword Tool told me get no monthly searches.
After around a month I checked the stats. I was gettign TRAFFIC and a few sales - not many - but sales.
Now what I'm saying is, don't totally trust the keyword tool. Instead, be logical and target keywords that make sense to your website whether or not the Tool says it gets searches or not.
You might just be surprised.