There's an optimum number of beds for a hotel when it comes to profit. Currently we fall short of that.
I'm not an expert in hotel construction or the accommodation business but it must be slightly more complicated than that.
Of course, but there are certain fixed costs when running a hotel that don't significantly increase when the number of rooms, and therefore potential revenue increase.
Obviously there are other, more variable costs, but assuming the plan is to build a profitable hotel, then those variable costs should cover themselves.
And let's be honest, with the concerts, the casino, and the conference facilities it makes sense to have more accomodation.