Generally, if you are curating magazines on Flipboard, the reason people will follow you is because they like more than one of your magazines. It's easier to follow your profile in general than all your magazines individually.

When a user follows you, all they will see is the best of your flips, comments, and liked articles in their home feed. If someone follows your profile, and you’re not curating public magazines, they will not see what you’re reading or following.

If you do not want anyone following you on Flipboard, you need to make your profile private.