Until the recent upset with google the other week, one of my sites has been doing 6,000-8,000 SE Query referer uniques daily.
It may not seem high, but it converts well if directed appropriately.
Diversity of search phrase prominence is key. You do NOT have to be on the first three pages to make money from SE traffic. I get signups from up to page 10 SERPs.
'Owning' a large stable of thematic keyword phrases that are uncommon adds up bigtime!
If you're interested in legit tools for building your SE traffic without breaking a sweat or your pocketbook...
Instant Content Solutions
-Dino