I said 'Often' because depending on the degree and manifestation of it, it can be very dehibilitating and harder to find 'advantages'. It is a spectrum. And yea, people with ADD need to put themselves in situations where their creativity, inginuity, boldness, hyperfocus and hypersocialibility (typical traits) can be used positively. And, btw, I have ADD and do call it an advantage. :)
OK, I thought from your post you were doubting it exists. My bad.
Having it can realllllllly suck, but yes, it can also have it's advantages.