For some product categories, virtual reality can be used as a virtual storefront, with the possibility for the buyer to interactively create the product he needs. These are virtual windows of furniture, cottages, buildings, cars and so on.
Sometimes virtual reality and 3D visualization are simply necessary for presentations at exhibitions when the exhibit is very large and physically impossible to demonstrate (power plant turbine, aircraft, ship, building, etc.).
Examples of the use of virtual reality for marketing - https://invisible.toys/virtual-reality-development/vr-marketing/ .