“In late 2012 Facebook made changes to the newsfeed that caused the reach for brands to drop as much as 40% compared to earlier in the year. Posts for the average brand page are now being seen by less than 10% of their audience!” http://http://socialmediatoday.com/smartseodesigns/1624191/closing-your-facebook-page-3-questions-social-media-strategy
So if your business page has risen to the giddy heights of 500 ‘liker’s, only 50 people will see your latest post. It might be worth more to your business to have a tab for signing up to regular emails – if you want to send out offers or news to your audience, this might be a better way to reach them.
Think about how much time you spend trying to promote your Facebook business page, vs the number of likes you get as a result, and how many of these will result in sales. It may be worth looking at other ways to promote your business.
For what its worth, I still think it’s better to have a Facebook page, but use it to grow your email list using MailChimp or Constant Contact and grow your customer base that way.