Yes, it is unusual to waive your right to notice of the hearing: by giving up the right to notice, you effectively give up your right to object if you later have concerns, to possibly be questioned by the judge to make sure that everything is on the up-and-up before it approved, or to potentially hear other objects presented by other parties at the hearing, which may cause you to realize that something was improper. There is no reason why someone presenting a fair, honest offer would object to you being noticed of the hearing, since simply getting notice does not in any way guaranty that you will raise concerns or cause problems--it simply makes sure you're aware of the date and venue review and ratification of the transaction.