Image Only Ads

How do they pay

[Fish_Texas]

I'm trying some Image Only ads...How do they pay?
Is it PPC, CPM OR by Action only (fill out form etc.)?

Has anyone been successful with this? Your experience?
Feedback Much Appreciated: Thanks in advance.
Fish Texas

[celgins]

There are two types of image ads.

Those which can be selected through normal CPC ad units and those which can be selected through CPA ads.

The CPC ads may either be pay-per-click or CPM. All CPA ads are pay-per-action.

I've been trying to use the CPA image banners, but they don't seem to work. Google wants to choose the best paying ads when using CPA banners and they often choose text-based ads.