Design Quality: The design quality of a Premium Theme is very high. To make a good design you have to maintain margin padding, Typography, and Visual Hierarchy. You will see all these things in a Premium Theme.
Code Standard: The coding standard is also very high of a Premium Theme. You will get w3c validation, SEO friendly coding and also all themes are responsive so you can easily access from any device. Within $59 you can buy responsive multipurpose themes. This is help you to make websites for different categories.
SEO Friendly: In WordPress, you will find so many SEO plugins which help you a lot in SEO. These themes are also light weighted and fast to load in a browser. This is very important in SEO.
Free Support: People are getting free support from the authors of those themes and templates. So if someone finds an issue then he just needs to contact with the author of that theme via support.
Free Updates: People will get free updates on these themes and templates.
Great option for B2B: To Buy Premium WordPress Themes or to Buy Premium Bootstrap Templates is a Great option for B2B. If someone is running a web design company then they can easily serve their clients by customizing this themes and templates. They don’t need to put a huge effort.
Vast Community: The WordPress and The Bootstrap community is huge. So If someone is facing a problem then they can easily get help from the community.