test it?
your asking if it will pay you back without providing any information, not that it would matter much anyways.
if it was me, and I was marketing on FB for the first time (which I don't, so take it for what it's worth), I would start with something small, learn how to avoid being banned, and then start buying the more expensive FB accounts (I'm guessing one with 5k friends costs more then one with no friends where you add a few, even if they are just yourself). Start with your little FB account and see what you can do to not get banned and even make a buck or two. Then like everything else, just scale your efforts.