Clarence - 3:01 pm on Dec 9, 2012 (gmt 0)
If Ad Networks earn you more then you should keep them.
Kinds of says something about your websites if Adwords Advertiser don't earn more on your site then the Ad Networks.
Either your site is in some rare niche without a lot of Adwords Advertisers, or your site is completely un-targeted and most of your ad income comes from impressions from Ad networks, or your site is about a spammy subject that fits the nature of most Ad Networks inventory.
For you I would say, either leave it alone or block Adwords.