You're conflating Disney and DVD. If Disney was indeed of this mindset, it's very shortsighted.
Suppose you are the only mechanic in town. That is the bulk of your business. You hire your brother to sell cars on the lot adjacent to your shop. You service every single one of those sold cars, because hey, you're the only show in town.
What your brother is starting to do is say to every person who brings their used car, a car who's original buyer bought at your lot, to be serviced, "Hey used car guy, you'll need wait out back instead. The lobby is for our customers only." And out back there's a smiling plastic headed mouse who is gladly taking your money... ok, so that analogy starts to fall apart.
But the point is: if your business sells a singular good that people buy and keep forever (like jewelry?) yeah, that mindset might work. But if you sell a product with a revolving door, where owners will not hold onto the product for it's lifetime, or if you're Disney and your idiot brother DVD starts shooting himself in the foot (How many owners, resale or otherwise, were considering buying Riviera direct before the restrictions were announced?), you need to take stock and ask yourself if your brother's business practices are good for your business.