I'm a little surprised at the implication (at least the way I read it) that FD people are consistently lying to MR members. As a former FDC at a CY, my personal experience is that there is no reason to lie to guests regarding the availability of specific room types. You either have it or you don't. MARSHA could be annoying, but I don't recall ever pounding on the keyboard for minutes at a time to change a check-in's room. Yes, on occasion the availability was based on the customer's attitude, but that was my shortcoming, not the company's.
Jeez, if you think they're conning you go somewhere else and quit whining...