I've honestly never seen pure perfume oil in the sense of 100% aromatics and no dilutant. Parfum extrait is usually the highest concentration, but I doubt you'll find many that are higher than 30-40%. A Middle Eastern Basenoter here said that even "pure" oud oil tends to be diluted in their area to 70% to be more wearable, and that's a higher concentration than I've ever heard of in western perfumery.
Of course, raw essential oils and absolutes aren't - or at least, shouldn't be - diluted when you buy them, but I find few are wearable as fragrances themselves, especially undiluted,
Ultimately, extraits tend to be overpriced given that often all you're getting is something that's, say, 5% more concentrated, but they often have a distinct character from the EdT or EdP versions ( see the many discussions of the different strengths of classic Guerlains, for example ).