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Buying large number of a hardware product automatically gives you some preferential treatment, as in both the client and the manufacturer must cooperate deeper just to absorb impacts and make logistics work.

You can't just click to buy a boatload of wireless earphones and have it delivered overnight, because regular boatloads has to go to regular stores. Regular 3-day shipping will become a 3-month delivery reservation or a 18-month supply contract. Potentially a special batch production, shipping, and trucks from port to your warehouse might have to be arranged. At that point the manufacturer might as well accept minor tweaks such as logo tweaks and configuration changes for that manufacturing run, or could even negotiate with you to take one just to prevent that batch disrupting regular consumer sales and supports.

But it won't increase combined total available budget of that operation above combined cumulative margins and cash flows, it won't print money, only distribute more effectively. So your contribution towards total "market cap" of the product might not make up for lost sales if product flopped even if you were an important customer.