These short, generic domain names (like perfume.com) had some value 10 years ago, when Internet search was still much more of a chaotic crapshoot.
Today, you could practically run a thriving ecommerce site from just a static IP if you spent a little bit of time on SEO. People go to google, type in "perfume" or "buy perfume" and go off to either the text-ad sites, or the top organic results.
Users have been trained on the idea that "domain guessing" is hopeless, and more than likely to land you on a pr0n site or ad site (like those domains are currently configured).
Also, for many of these e-commerce related sites, there is a large percentage of people who are looking to buy perfume+something else. If your site is so tightly optimized around 1 product class, I think you'll lose a lot of business to people who want to buy 3 products from 1 vendor, not 3 products from 3 vendors.
IMO, the majority of these domain squatters have so thoroughly skewed or ruined how people find products of interest that they have no hope of suddenly turning things around by turning these domains into what they should have done from the beginning.