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Looks do matter when it comes to your blog. The more professional and crisp your blog looks, the more your readers will take you seriously. If you are interesting in boosting traffic, you should try a more serious layout or presentation for your blog. If you can afford to hire a professional, you should. If you choose to do it yourself however, you must make sure the end product is good. If you have a sloppy blog that looks "homemade" you will not likely have a great response. Try different layouts and approaches to see what gets you the most traffic.