Wireless headsets as with everything has both advantages and disadvantages.
Pro: No wires all over the place, can move across the room with them on
Cons: Have to remember to recharge them, sound quality can be not as good as wired.
Most wireless headphones come with a optional wired connection anyway and unless you are a audiophile, the general people don't really notice the loss in quality.
It's similar to wireless console controllers. With wireless, you can sit back on your couch without worrying the wires getting tangled all over the place. That is a stationary setting too. Granted, it is not as close as sitting in front of a PC but I prefer my headphones to serve a multipurpose rather than just for PC. I would like to use it at night if I don't want to disturb other people when watching a movie on my TV too.