Most hotels whom I’ve asked about this say it’s either because it’s such a low contract rate being paid for the room or because we’re not personally paying for it. At some hotels you can work around it by putting down a credit card for “incidentals” and charging something to your room. The downside, I once was charged for all four of our crew rooms for the evening. The hotel was less than helpful to reverse the charges so I reported it as a fraudulent charge with my credit card company. I don’t bother trying that anymore.