This phenomena is driven by Google's market dominance and weaknesses in their technology. The "hidden web" of truly awesome sites is massive, while Google continues to send massive quantities of traffic to sites with far lower-quality content.
I never see Instructables in my search results and I frequently see WiseGeek in my search results. Instructables is awesome and Wisegeek is spam, but Google's automated technologies can't tell that.
Long-term, quality content will win. Some technology will come along to connect information consumers with information producers much better than search is currently doing. Until that happens, people who are building great content will not be rewarded for it and people who are building low-quality spam will reap major economic benefits.
Google is currently only really rewarding YouTube for multimedia content. Other publishers who spend money to develop multimedia content will have great difficulty earning a return on their investment.
But really, having world changing unique ideas is the only reason to live. Maybe people won't accept them in your lifetimes; maybe people won't accept them ever -- you still have to try.
barrier to market entry.
There will always be lots of competition for things that are easy to do, but step just a little bit above the norm and you'll find yourself suddenly alone.