There is a pervading myth that by inserting words you think are relevant to your site in your keywords meta tag, you will automatically improve your search engine ranking. The truth is that only a select few search algorithms utilize the keyword meta tag. Keyword Density SEO Tool calculates relevant keyword phrases by analyzing ALL of the words on the page, not just the meta tags.
When is a keyword seo tool likely to increase your profits? This depends on the campaign, but likely if an untapped niche is found, it can be sooner than you realize. Most consumers are on the internet for one reason — information gathering. If you can help them find what they want or solve a problem, then you will turn a profit.