"The first open, Top-Level Domain specifically created to combine Ethereum blockchain innovation and security with meaningful, easy-to-use .luxe names – the .luxe standard that "lets you exchange easily"."
——From "join.luxe"
From a domaining point of view, I think this extension is a waste of time. However, I would surely register: car.luxe and house.luxe, villa.luxe and jewelry.luxe, if those were available with a regular (low) price.