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"what keyword pays the most"
"How much can I make with X visitors"
"What do I need to make $X"
I think that the person really wants to make 30 sites instead of one specially talking about 5 page sites. Not that there is anything wrong with that IMHO. Others might think differently.
I am thinking about creating a simple 5 page site with 30 incoming reciprocal links. Then putting adsense on it at the top, in a prime area.
Where's the traffic coming from?
I don't think these type of sites have a big future with Google SE.
Of course I could be misunderstanding you.
Personally, I think this advice from Brett Tabke is as sound today as it was two years ago.
"Successful Site in 12 Months with Google Alone"
You can get far better milage that way.
Site A has the same content as Site B. It depends on the *motive* behind the sites as to whether you are breaking the TOC or not.
So I can simply say, I created the site for the articles but then decided to put adsense on it afterwards.
I think this definition is to prevent the TYPE of site, not the intent of the site. In other words, it's OK to create a site if you're planning on using Adsense to fund it but *not* OK if you create a site that gives users nothing to click on but Adsense ads.
Back to your original question, I have a site that gets 10,000 pageviews a day and I'm making about $2/day.