I've been liking them from both my personal and my business page. Facebook has been making a lot of changes lately because they are trying to focus on selling advertising to the businesses that use their service. Due to this focus many posts you make as a business are never seen by your customers. This is because Facebook wants you to pay money so your posts show up as a "sponsored post" in someone's news feed.
If you like a business page from another business page I don't believe the results are filtered in the same manner. So, whenever I have the urge to lazily catch up with all my Autogeek buddies I turn to my business Facebook news feed and get to see everyone's recent details and what not. I don't get to see everyone's post all the time on my personal page...
Wow this post became way longer than I intended it to, lol. Anyway, that is why I like everyone's pages from my personal and business Facebook acct.