No one said you had to care about it.
But if you're a Christian, I don't know why you wouldn't be curious about what could potentially be Christ's burial cloth.
Besides yourslf, there are other people in the world who can benefit from this, like the atheistic scientists who studied it, and became Christians.
I agree with your point. Some people likely will believe because of the Shroud that would not have believed otherwise. They will be with us in Glory .... Sad that we know many who will not be there....