Completely agreed with @ULTiMATE;
I strongly believe that people have a state of mind when they do things. For example, when I go to a B2B event, I am in the business state of mind. When I am on Facebook I just want to play games and post something cool on my page. I don't take to advertising. Having said this even if you grow your FB page you'd struggle making money from it, unless it fits into the genre of your social thinking at the time, if that at all makes sense.
From experience I found community pages to grow on their own, I tend to get 2/3 likes per month without posting or advertising. Occasionally I post, but considering there is so much to learn on web technologies I really have overlooked keeping my Facebook page current.
There are so many business here who feel a Facebook page 'is' a website, particularly in my educated neck of the woods. Having said this people ARE replacing their company websites with a facebook.com/companyname. Not that I entirely agree with this, but it's happening.
Apart from that, I can't see an immediate benefit of having a Facebook page on it's own. Ideally it needs to be there to compliment an existing website, and as of such your business should go in this direction: Websites => Facebook Page => Like Page, rather than Advert => Like => Website. From exprience I've never returned twice to a website found on Facebook. If I did not Google in the start then I won't be interested in what's on offer. Unless of course I liked the page from their website. That's a complimentary different story.