My brother is the sales manager for a bathroom/kitchen supply company, they manufacture and supply the bathrooms and kitchens for most of the big retailers. He was saying that they have a very strict price model and retailers are not allowed to discount below a certain value. The director is old school and doesn't like websites so gives e-commerce a lower discount value than showrooms to prevent customers from going in to view the bathroom in a showroom and then buying online for much less.
I'd go one step further and suggest a manufacture doesn't supply to anyone who doesn't hold stock
All these e-commerce sites with 1000's of products listed at the click of a button and not even stocked?