HuskyPup - 12:54 pm on Jan 27, 2012 (gmt 0)
The answer is relative to the site's purpose.
Plus, of course, the best achievable CTR and EPC.
If page views alone were the answer then why do so many forum boards earn relatively so little in comparison to their traffic levels?
If one is in a niche market like myself then there is inevitably a limit as to traffic volume, sure I do have have competition but nothing like the amount of competition for the huge traffic popular subjects and it's very doubtful these days whether a one-man band could achieve this.