Just because the aftermarket part looks like carbon fiber, does not mean it is. The part could actually be died fiberglass, a vinyl sticker, or perhaps just a single layer of carbon fiber with multiple layers of fiberglass below. The point is, it is important to know what you are really buying.
If you want to make profile fast, high quality, and with little scrap. Chances are pultrusion is for you. There are a few industries which have realized this, and most everything in that category is made through the pultrusion process.
If one is designing a product out of carbon fiber or fiberglass, using prepregs can be an excellent choice do to their consistency and ease of manufacturing.
It wasn't too long ago that anything made of plastics was thought to be inferior. Now, with advanced engineering and processing methods, plastics are often far superior to other material options. A great example of this are fleece jackets, which are now made with recycled PET water bottles.