[gsnedders]

That depends on whether the ad is sold based on conversions, clicks, or views. All three models are in use on the web.

[falcolas]

Remember, we're discussing a blog here. CPM, with rates in the $2 range, are not going to provide anything resembling reasonable revenue - let alone profit - for a blog post.

There are notable exceptions to this for bloggers who can get hundreds of thousands of views on a regular basis - but most people are lucky to get a thousand unique views.