Yes, it is. But only on super-targeted audiences.

If you are targeting customers who have already bought from you, such as in these email custom audiences, then you’re shooting fish in a barrel.

Most folks are lucky to get a 1% CTR on Facebook.
But 20-40% is common with custom audiences (your emails loaded to Facebook or the website pixels).
Here’s one at over 80%.

And the high CTR means you get a low CPC (cost per click), which translates into a low cost per sale/conversion.

Are you using Facebook to squeeze more out of your other marketing efforts?