Making money - Norms about $ / visitor

[johnegood]

I'm looking for some ideas on what is a good amount of money to make from advertising.

(OK, skip the jokes about ALOT)

Specifically, in a field like education, how much should I site be able to make per visitor. Is $.01 good or bad if I'm relying on ad networks, google ads and affiliate programs?

The ad networks talk about $2.50 CPM (I guess that means per thousand impressions which would mean $.0025 per impression). So if each visitor generated four impressions, does that mean $.01 per visitor?

john