Most pay $.01 to $.10 a click. But the person actually has to make a search for you to get credit for it. Some words pay more and some pay less.
All kinds of companies offer search feeds. Other companies like webanyway (not a direct feed but do offer xml feeds) you can sign up for their program and get an xml feed through them. They pay a percentage of every bid. Well, most feeds do this normally between 50% through 95% (which equals the 1 to 10 cents).
Most have min. payouts of around $50 unless you do the ones that have indirect xml feeds (example webanyway, gofeed, etc) then the min. payout is a lot lower like $5.00).
Hope that makes some sense and sort of answers your question.
Sedo.co.uk is also an option and very easy to set up. I'm getting an average of 0.9 EURO per click with them. Problem being obviously that you lose complete control of the domain. Don't count out adsense either, they can pay VERY well on a per click basis.
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"There was a time when a fool and his money were soon parted, now it happens to everyone." -JM Keynes
Depending upon placement you can also increase your click through rate, i.e. CSS overflow positioning will let you "float" your ads so that they remain fixed in position regardless of scrolling.
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"There was a time when a fool and his money were soon parted, now it happens to everyone." -JM Keynes