Facebook has really been cracking down on this process with new algorithms to detect this activity - in my opinion, obtaining legitimate fans is the only true way to promote on Facebook.
Buying Friend are useless because all are botted fans, not human peoples, try to get real fans related to your niche.
Don't ever think of buying any page or fans.. Facebook will unpublish page eventually..,. so try to get fans through legal ways... Read this article may it will help u http://chal-oyee.com/tips-to-increase-your-facebook-likes/
Bought fans tend to decrease from your page immediately you make the payment to such providers. Tried to buy twitter followers and it was all the same. As someone posted, try fb ads