In our experience, while Facebook ads target more than just people actively looking for what you sell (unlike Google Ads), the cost to generate leads and clicks tends to be far cheaper.
This is because unlike Google Ads which operate based on a bidding system, pitting you directly against your competition, Facebook ads don't.
This allows us to show your brand and offers to more people, skyrocketing brand awareness and capturing people who may be thinking about purchasing your product or service, but need a gentle push (like a great ad showing up on their Facebook feed) to get them going.
When used in conjunction with Google Ads and SEO, Facebook ads give prospective clients and customers the feeling that your company is everywhere, something we call 'omnipresence' that helps drive conversions and leads.