Simply speaking, wrong keywords mean lower traffic and thus lower revenue. For healthy site optimization, importance of use of right keywords can not be over emphasized. Proper keywords puts your site to a solid foundation and road to success. The sites that are not designed on established principles of healthy site as keywords either fail to attract good traffic or are forced to employ shady strategies as getting fake traffic from robots which definitely does no good to any site and rather expedites the travel of the site to sunset of search engine results. Choosing right keywords does require some research and present trend. As an example, there was a time when “biodata” was searched by visitors but now word “resume” is searched more times.
Following suggestions in selecting keywords would help you get the right keyword and density and thus help you in getting more traffic.