You won't need any new networks now that you're using AdThrive: we have a great group of ad suppliers already competing for every pageview on your site, and are constantly adding new advertisers into the competition for you.
Generally, the kind of ad networks that send out pitch emails are not the kind of ad networks that are worth including on your site. New ad networks are popping up all the time, serving their ads on bloggers' sites, and then closing down without ever paying the bloggers, or they may serve ads that aren't family-friendly, have malware or popups.
AdThrive has access to the same sources of ads as those other companies, only we pay you a higher revenue share than other ad networks. That means that you can finally just ignore all those pitch emails and rest assured that we're working hard to make sure that your site is serving only the cleanest, best ad sources.
In the past, there have been a handful of premium ad networks that were worth using in addition to AdThrive Media, but the industry has been changing fast and there aren't any premium networks that we can currently recommend.
When new sources of ads come along, we're working on those for you through our connections and setting up those accounts on your behalf, and you can feel free to click "delete" when those pitch emails hit your inbox.