The reason why you as an Employer should add a profile is to give the virtual assistant who is looking at your job posting the sense of interest and excitment to be working for you.
Its very important to create a good profile image as the better your image the better type of virtual assistants you will attract.
Last and not least your short profile will tell the virtual assistant that is looking at your job posting what type of company you are what you do and will see maybe your mission, vision statements and know what to expect from working with you.