Rare ingredients? No wonder the "limited editions" come and go from that house. Those will be out of my price range.
I do think that many absolutes qualify as complete fragrances by themselves, but most of the time they have off-notes that ruin them for this purpose. I bet Slumberhouse uses fractional naturals. That helps make them smell better.
It takes skill to blend natural ingredients in such a way that the general public will accept them, having developed a taste for sweetness. I tried to make all-natural perfume for years and never came up with anything that lasted long enough or smelled sweet enough to wear confidently in public.
Maybe Slumberhouse will help change people's attitudes about what constitutes personal fragrance!