PPC/CPM advertising revenues lower than email parking revenues

Despite having a large number of websites with some traffic the domain investor finds that the PPC/CPM advertising revenues are far lower than the email parking revenues for last 3-4 years. Every month she is getting at least $6-7 from email parking, but from PPC/CPM advertising she is not making even $0.5 in a month.
In most ad networks the domain investor is only making less than $0.1 monthly from PPC/CPM advertising
She is finding that she is not being credited for page views, and clicks due to which the revenues are very low
If anyone knows any ad network which measures page views accurately, please email info@blogposts.in