TextAdMarket – CPC or CPM addition?

I need a bit of advice before moving forward with an idea. My ad network, TextAdMarket, is CPD "Cost Per Day" where you pay a flat rate for each day of advertising on a specific website. I’ve been around here for awhile, and quite a number of DP’ers have registered at TextAdMarket, so I thought I’d ask for your opinion.
Here is my problem:
The CPD concept has been going very well, but, as a new network, many of the ad spaces are just being left empty. The top performing sites are being snatched up, but I just have mounds of low traffic sites that aren’t selling. By themselves, they might not be worth anything, but together, they are serving up thousands of impressions a day. Sucks for the publishers because they aren’t making revenue on those ad spots, and sucks for my server because of the […]

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