Problems you face while searching for a Virtual Assistant

My idea is to help businesses and entrepreneurs get quality, affordable, part time Virtual Assistants on a monthly subscription basis model.

Virtual Assistants help business owners with routine, time taking work like admin work, web research, email management, social media, content work, project management, marketing and what not.

Currently, I am trying to understand what specific niche or problem can I target in this field.

Did you face any particular issue while hiring a Virtual Assistant? What was it and did you find a solution? Was there a problem with finding the right skill?