That's not absolutely the case, bobby. Proof that having good traffic driven keywords and relevant targeted content comes in every form of site imaginable without one keyword in their domain sake. Here are a few examples:
Google, Ebay, Twitter, Facebook, Digg, Yahoo, Bing, Ask, Amazon, Zappos, Target, Wal-Mart, NetFlix, Blockbuster.
Just to name a few there and all of them have primary keywords NOT listed in their domain names at all. They are sites that operate with a short list of ' related ', targeted keywords that are rich in traffic, provide relevant products/services to that traffic and provide the most relevant and productive content for the search engines, which just happens to be user-driven content in most cases; google, ebay, digg, facebook, bing, yahoo, ask, to be specific on those who do from the short list of respected sites above.
The rest are simple product/service sites that promote the more traditional method of ' We've got it when you need it ', brick and morter practices.
None of which required having their keyword in their domain to succeed in seo or in business ranking. Try to keep an openmind about things, as locking yourself into one mindset can block you from seeing that inwhich will show you how to succeed the best in your ventures.
Food for thought.