I don't think anyone except the hotel's management can answer that question. A reasonable assumption would be that it's basic economics: the suite sits empty a lot and the hotel is pricing it at a discount to entice travelers to book it over a regular suite. Many able-bodied travelers dislike accessible rooms, and someone spending the money for a suite may be especially unwilling to accept a room they consider inferior. It would be interesting to see if they "downgrade" regular suite bookings to the ADA one (and without having seen the suite it's hard to know how much of a "downgrade" this would actually be; I've seen numerous ADA rooms and suites that resemble a hospital room, while others use basic and fairly unobtrusive universal design features and many people wouldn't really notice they're in a "special" room.) There could be other things that make the suite less desirable; accessible rooms tend to be on low floors, near elevators, etc (this tends to matter more at resorts and upscale properties, however). Hard to tell without looking at the suite. Maybe you could convince your partner to stay there if you say some paralyzed chick on FT has asked you to investigate the suite for her?