A hotel rate quoted without a mandatory daily fee understates what the stay costs. The separation is not accidental, and it produces several effects beyond the headline price.
The fee separates rate from total
Resort or destination fees are charged per night for services bundled together, and they are mandatory rather than optional additions.
Because they sit outside the room rate, a search result comparing nightly rates does not compare what guests will actually pay.
Comparison sites rank by the figures they are given, so a property quoting a lower rate with a higher fee can outrank one quoting an all-in price.
Commissions and taxes are calculated on the rate
Distribution partners are typically paid a percentage of the room rate, so revenue shifted into a fee reduces the commission owed on the booking.
Occupancy tax treatment of such fees varies by jurisdiction, and some cities and states tax them while others historically did not.
Those two effects give hotels a financial reason to structure revenue this way that has nothing to do with the services the fee nominally covers.
Corporate and points bookings are affected differently
Negotiated corporate rates cover the room rate, so a mandatory fee can fall outside the negotiated price and land on the traveler or the expense report.
Award stays have historically been a point of friction, since a free night that carries a mandatory cash fee is not entirely free.
Loyalty program terms differ on whether these fees are waived, earn points or count toward status, and the answer changes between brands.
Disclosure rules have tightened
Federal and state enforcement has focused on whether the total price is disclosed clearly and early enough in the booking process to inform the choice.
Several states have enacted requirements that advertised prices include mandatory fees, and rulemaking at the federal level has moved in the same direction.
The practical effect is a shift toward showing the total price upfront, with the fee itemized rather than hidden until checkout.
The same pattern appears elsewhere in travel
Rental car concession recovery charges, cruise port expenses and short-term rental cleaning fees follow similar logic in their respective markets.
Each separates a mandatory cost from the advertised base price, and each has attracted the same regulatory attention for the same reason.
A traveler comparing options usefully is therefore comparing totals at the final booking screen, since that is the only figure the different structures render comparable.