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Jane_Doe - 6:14 pm on Mar 8, 2006 (gmt 0)
I work by that, too, and take it a step further. I know how much each of my sites makes per page per day, and then for each site I calculate how many pages I can make in a day. Some sites may make more per page but they also take longer to put up a page. Then I add in an overhead factor for things like renewing domains, reading WebmasterWorld and link building, so I have a pretty good idea of what I make per hour.
I am amazed to learn that return/page isn't a virtual rule of business. It is in mine, and I couldn't come to work each day without it as a guide to how I will invest my time.