Yes, I know there are good reasons to do it sometimes, but still don't get what about SqlDataReader benefits from it, other than "I don't know why would anyone

Yes, I know there are good reasons to do it sometimes, but still don't get what about SqlDataReader benefits from it, other than "I don't know why would anyone would want to inherit from it". Looks like my issue with that got fixed with extension methods, which should let me tack on such improvements whether the original designer of the class thought that would be a good idea or not.