The snarky part of me wants to say "because they can be," and be done with it. But the truth is, the best wireless gaming headsets are more expensive than their wired counterparts because they are packed with tons of expensive, high-end tech. It costs more to make sure a Bluetooth or RF wireless headset is actually going to work with your PC or console than it is to make it use a 3.5mm or USB adapter. They're also usually packed with premium features like customizable RGB lighting, active noise cancellation technology, and dynamic audio processing. Which, again, means they're more expensive to produce, and therefore more expensive to buy.