I was shocked sometimes to see more number of likes in certain Web Pages. Latesr I understood they are bought for some Prices.
No Need to buy anything to grow a fan page on facebook , Try naturally. if you have a Good and Interesting niche it will gain automatically dude
No need to buy fan pages for facebook because natural and relevant likes by wall posting and chating is best way.
If it is viral worthy then no need to buy. BUT, most people promote anti-viral (cpa, etc.) so buying or exchanging likes lends them more credibility.
Only people that join by there own interest are more valuable. So if they increase slowly but naturally then that will be better.
Facebook allows you to connect to any audience all over the world, of course it's useful. When creating a page, people would rather click on a like page with a few hundred likes than 0. Many spammers use Facebook to post spammy like pages, you don't want peolpe mistaking you for that. First establish a few hundred then let it go viral.