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Britney Spears or Financial stuff
Banner ads via cpm, direct high converting aff, or contextual
(and how good you are at placing them, preselling, etc.)
Forum/blog, content, directory, etc. etc.
Do visitors return or are they one-hit wonders?
Many variables can lead the answer to either end of the spectrum.
Webmasters often report revenue of a penny per visitor up to 10 cents per visitor. Sometimes more and sometimes less, but usually in between. There are a lot of sites that make zero, but if you are trying to make a profit I would think that it would be in that range. At least that's my experience.
As for the type of web site that would receive such traffic, I can't answer that for you..
dataguy, if your numbers are correct then why can't i buy AdWords for 10 cents per click?
I don't know, why can't you?
Some markets are more competetive, but many people have built their web businesses on traffic from AdWords for under 10 cents per click. I've got a web site that for every $.50 I spend on AdWords I make $1.00 in AdSense. It happens every day. I haven't been able to make this site scale very well so it's never made more than a few dollars per day, but that's more profit than a lot of sites.
Maybe I don't understand what you are asking....
On the other hand, you could build your business totally on free search engine traffic, have everything wiped out overnight and then spend your time on endless update threads.
There's a balance that needs to be struck somewhere in the middle.