I do think that it depends on if you have poker player mentality.
In theory yes you should be able to build a business online in the same way offline - but we all know that sometimes it gets a bit crazy.
However, in terms of traffic - there are more search engines than Google.
If you build your strategy on all the majors, Google, Yahoo, MSN, Ask - and you put your ROI figures in to your calculation (and it doesn't rely on one of them) then it will work.
When the going is good with Google then work hard at finding what works with the rest of them, don't wait for Google "update disaster" before you look at what you are doing.
But in general if you have the traffic now, you aren't taking a fine line, and you have spread your risk across the other engines - than why not?
If your strategy relies on Google - then you have to be a good player!
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