Here's how it works, to the best of my understanding...When you 'like' a page, at first, you'll see all the updates from that page in your newsfeed. If you interact with the page, in the form of likes, comments, or shares, you'll continue to see what that page posts. If you don't interact, eventually, in most cases, that page's posts will stop showing up in your newsfeed. So, the more involvement you have with a page, the more you'll see from it.