Dunno about at the start of the endeavor, but if they manage to buy out the whole after-market such that they can build the
expectation that no real market exists, then both buyers and sellers will not even
attempt to sell/buy at “true” prices, and instead look directly at “certified” and new models only. If I value a car at $5000, but can’t find that price anywhere, then I simply have to accept that its being valued higher by the market. If I want to sell at $5000, but can’t find a buyer, same story. Even if both persons exist simultaneously,
if they can’t find each other, then there will be no sale.
So by making use of the information disparity, and manipulating the perception of the used market, it should be possible to keep prices artificially high.
The same kind of strategy works for diamonds at least, where “used” diamonds are not worthy of usage, so prices are simply set by the businesses; I know the video game market is also trying to get in on it, by gobbling up used games (eg through gamestop), keeping them out of the secondary market early (by encouraging sequels, trade-ins, etc), which then lets them set the prices on them later (particularly useful when you want to sell emulated games on the e-shops)