There is an inyan that only a married person should daven for the amud on the yomim noraim. So there is a legitimate thing about limiting things to only a married person in certain inyanim.
There is an inyan that only a kohen should perform a pidyon haben. So there is a legitimate thing about limiting things to only a kohen in certain inyanim.
As you can see, you can apply your logic to almost anything. The real question to ask, is this one of those inyanim? If you believe it to be the case, please state why and how.
The Wolf