I think it's worth asking yourself what you're looking to get out of Facebook likes. How often do 30+ urban professionals look at their friends' likes?

Running facebook ads is a great way to get likes, but are the likes worth that money? I'm in my 20s and I almost exclusively use facebook for sharing links. You said you already have an interesting blog, are people sharing that content? How can you encourage that?

I'm not saying that you should avoid facebook, just make sure you know what your goals are and what metrics you're going to use to measure success vs failure. If getting facebook likes makes sense for those goals, then by all means go for it. If getting facebook likes isn't important for your strategy, then don't worry about it - your page will grow organically as your user base does.