Yup. Agreed.
Kingseesar. Please go to
http://inventory.overture.com and type in your main keyword (the one your are ranking well for). How many searches does overture say it is getting?
(If you want to be perfectly sure of how many searches a word is getting and more importantly, how it converts then you really need to do a PPc campaign IMHO or at least use a paid service to find out).