Depends on what the network accepts. For example, Value Click Media accepts CPM, CPC, and CPA campaigns. You can deselect the campaigns you do not like, but everything really depends on on the type of campaign, your click through rate, and ROI for the advertiser. Ad Pepper, another good company also does the same. I am testing some of the Right Media networks out, but due to the fact I am new to the two I am testing, I've not listed them in the network list I posted a few days ago. If I get paid, I will add them to the list.