What makes your FB ads cost so much?

I hear so many different things regarding FB cost. What do you look at when trying to keep your cost down for FB ads... CPM, CPC (all) CPP, CPC (link clicks) or something else. I notice when my cost per purchase is low and my CPM is high I get billed quicker.

Here ya go buddy.... was gonna write something quick here, but decided to give you something with a little bit more meat on the bone.

https://www.blackhatworld.com/seo/tutorial-how-to-get-10-ctr-0-10-cpc-with-fb-ads.1017837/

You want to start new campaigns with low daily budgets adsets. Like $5 or $10. And then scale from there. That's how you'll keep CPC low. use oCPM with a new campaign with large audience size (500K to 1m).