“Cost Per Day” Ad Networks?

Most forums classify advertising into 3 categories: CPA, CPC, CPM. I run TextAdMarket, where prices are CPD "Cost Per Day". I don’t know of too many other ad networks that charge "per day" rather than for clicks or impressions.
Does anyone here use a CPD network? If so, what is it, and do you have any results? (state whether you were an advertiser or a publisher)

See original post by TextAdMarket