Some of the WordPress premium themes are just pain in the air. They are really hard to configure. While authors, designers want to give full control over a theme, they just mess it so much that you end up with something which has no relation what the designer intended to do at the end.
You need to learn theme structure, posting patters, paging patters and much more. How to add images to posts, featured posts, sliders.
They are mostly pain. When you lose time to configure these, you lose so much time that you can actually publish like hell during this time. Therefore, do not use premium themes that make you design your website yourself, on your own, what is the point anyways paying so much for that?