It would only be worth it if the vast majority of the people that would see it are in your service area. Chances are a good amount of those people are spread all over the place. With the FB Ads, you can tweak it down to a certain area, not sure if you can do it with this other type of post promotion. But FWIW, I tried out FB Ads for a while and don't think I got one new follower from it. Actually I don't think I've ever gotten a new customer from my FB page, maybe I just didn't go about it right. So now I just try to make it a place to post pics and keep past customers up to date with new stuff, etc and concentrate my marketing efforts elsewhere. I'd love to hear about anyone who has had success getting new customers from their FB page.