Let's let unbiased experts answer the question of the benefits of having a Facebook Business page. I copied the top reasons from a blog post on Social Media Today by William Wells III:

http://socialmediatoday.com/william-wells-iii/307559/your-facebook-friend-requests-bad-business-annoying-me

On top of all these reasons, the advantage of having an RSS feed of your own listings and blog posts right onto your Business wall, lead capture forms that feed into your Real Pro Systems back office and drip email campaign(s) and a professional look that matches your website is unbeatable.

Excerpted from: 

Your Facebook "Friend Requests": Bad for Business... Annoying to Me!

...First of all, Facebook personal pages or "Profiles" are intended for people... not businesses.  Technically it's against the rules where Facebook's privacy policy is concerned although they don't appear to be cracking down on this at the moment.

   
Secondly, you should WANT people to "Like" your business page without you having to spend your valuable time administrating that aspect of your Facebook page.  Do you really want to spend an hour of your time filtering through "Friend Requests", sifting through personal messages and notifications, removing  "Bejeweled Blitz" score posts and other unnecessary garbage on your wall?  Wouldn't you rather spend 30 minutes of your time posting valuable information to your audience about special deals, what's coming down the pike, and engaging your audience in a meaningful way?
  
More importantly, here are a few key reasons why your business or organization needs a "Facebook BUSINESS Page":

SEO (Search Engine Optimization): Facebook Business Pages are indexed by search engines.  Personal pages... not so much.   In this day and age, with the unfathomable amount of pages and websites on the Internet, you need to be doing everything possible to improve your online visibility.  A well constructed and engaging "Facebook Business Page" will go a long way in helping make up for what your website is not currently doing for you.

"Friends" verses "Likes"... or "Fans": There is NO limit on the number of fans... or people who can "Like" your Facebook business page. However, there's a cap on the number of "Friends" you can have on a profile page.  That cap is 5,000. Do you really want to set limitations like that?

One "Profile"... many "Business Pages": You can have multiple business pages... however, you can have only one profile page.  Why is this important?  Think outside the box for a moment.  What if you're a Real Estate Agent by day... and you're a Karaoke Deejay by night.  Nope... didn't make that example up!   Or perhaps you own a small Bed & Breakfast, but you also own a consignment shop in town.  Didn't make that one up either.  Point is... you can manage multiple, yet individual, Facebook Business pages... all within one Facebook account.

Statistics and Monitoring Activity: Everyone loves statistics... hits... visits... etc.  Facebook Business Pages have such a thing.  It's called "Insights".  These powerful statistics display in a graph format and include "Page Overview", "User", and "Interactions".  How many people viewed your posts?  How many people "Liked" your posts, photos, or videos?  How many people have "Liked" or  "Commented" on those?  How many people "Liked" your page on a certain day?  And much more!  This information is invaluable when it comes to making your Facebook Business page more useful, engaging, and successful!  There's no such information available on a profile page.

"Landing Pages" and additional "Tabs": Technology exists now for you to turn a Facebook business page into a mini website.  For example, you could integrate an interactive business directory or events calendar right into your Facebook business page.  You could introduce an additional tab which might have printable coupons and special "Facebook Only" promotions.   This is impossible with a personal page.