It might lead to _more_ search costs; people head off into sketchy situations safe in the knowledge that if they press a little button a SAR helicopter will be scrambled.
Which it almost certainly won’t be. A SAR team will probably be dispatched when it is safe to do so. Which may take a day or more. It’s a limitation of a personal locator beacon. It had better be a real emergency and even then you have to wait. Location fixes may also not always be reliable.
