Originally Posted by
EricH
We're getting a bunch of theorizing here, but it hardly matters. The simple fact is that this is well within a hotel's pricing authority and this hotel has chosen to charge more for two guests than for one.
Doing a few dummy bookings for various dates at this hotel shows the same prices for 1 or 2 adults. Before declaring the 'facts', let's just wait for the OP to check whether adding the second adult has repriced the reservation from the booked rate to the current rate.