When you have lot of followers, your posts are seen by huge audience. If you are a frequent content poster on Facebook and want more real people to interact with your content but you dont want to clutter your profile with lot of friends. Then, this service is perfectly made for you.
Want to impress your friends? just buy this service and show them how many people follow you. When you have lot of followers, Facebook shows them on profile previews(when you keep mouse over a person's name) and also on your profile page. It looks cool, isnt it? Celebrities do this to their profiles for show off.