You can't just disregard the fact, that often designer scents are often made with different intentions than niche fragrances. Designer fragrances are nowadays easy and safe; the point is to please big crowds and do it right away on first testing. If this is the main goal, these fragrances are not very likely to be truly special. If it is enough for a person to smell nice, there might be no reason to go further from here.
I don't want to smell nice. From a fragrance, I want to find beauty, balance and clarity of notes. Smelling weird or exotic is not a value on it's own, it can add an interesting element to fragrance, but the sheer quality of ingredients and balance of blending is always the most important thing. I don't like or dislike fragrances like Dzing!, Nostalgia or Messe de Minuit because of intriguing theme. It's what's inside the frame that matters. Just like in other art forms, the shock value only takes you so far. Timeless masterpieces are much more than this. My point in saying this is, that it's not right to say, that we love exclusive fragrances because they are excusive.