1. If your CTR on your ads are too low, say below .05 the PPC feed provider will lower your Quality Score and raise your CPC
2. Not having relevant content on the lander will lower your Quality Score and raise your CPC.
3. Not having a good call to action keyword rich ad will lower your Quality Score and raise your CPC.
4. Not having a contact link on the landing page will lower your Quality Score and raise your CPC.