Does delivery or signature confirmation (DoSC, I made this up) service cost money? Is it profitable? If the answer is yes and yes then charging for and scanning

Does delivery or signature confirmation (DoSC, I made this up) service cost money? Is it profitable? If the answer is yes and yes then charging for and scanning 95.95% needlessly DoSC items is good for the USPS and the 3/4 inch requirement is seemingly stupid. If the answer is yes and no then a silly requirement makes sense, but is still silly. If the answer is no and no then the service should probably cost money.