12 Tips for Creating a Successful WordPress Premium Plugin or Theme

While WordPress itself is a free open source community-developed content management system, WordPress plugins as well as themes might be a “gold mine” for developers who would like to invest their experience and knowledge and earn some money. But it’s quite a common thing that the time and effort invested never get paid off, and an excellent item isn’t sold that well. Why does it happen? I tried to summarize my experience in this article that may be helpful to some beginner WordPress plugin authors, and give several tips that might be useful.