Respond with personalised comments rather than a generic Thank You. Fostering a conversation helps build the credibility of your blog!
Don't just type, talk to your audience. Blogging is way big a market on internet and people will like you if you do more than just providing information. Suggest, express, appreciate, criticize and have an opinion to build a relativity to a like minded audience. Make them feel that their visit to your blog matters to you.
Focus on good content, not on monetization. Over time, money and benefits will follow good content.