Premium WordPress themes are increasingly popular these days.
Why choose a premium theme when you can find one for free. Read on to find out why:-)
Premium WordPress themes are designed by experts to ensure that your site get maximum benefit out of the theme. They have a lot more functionality and more features to give your website the wow factor 
Premium themes are far more customisable. If you want to have the most options for design and search engine optimization without having to learn HTML backwards and forwards, a good premium theme is definitely your best choice.
Free themes do not have any support. But for premium themes you will receive great support to help you get the most out of your theme. You get access to the theme developer allowing you to ask any troubleshooting questions you have or perhaps you want to know how to do something on your website. They will often have detailed instructions or even video tutorials on how to customise/or configure a particular part of your theme. The support is usually in a forum style so you get the benefit on learning from other users who are using a particular theme. Even the best themes can have technical glitches from here and there so having good support is vital when using your WordPress theme.
The code is also much cleaner, with free theme, there may be some malicious code in it, to be bring your site down I say this with experience, in my early days of using WordPress.
Before you purchase a premium there is usually a demo theme available so you can see what your theme looks like as a website, so do check them out.
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