How exactly do you know this? Do you know what the BO pays for hay? Do you know how many horses or employees their are in this facility? (The larger the facility/more employees, the harder it is to have a horse on a special diet that requires an alteration in the routine.) Do you REALLY understand the extra work in preparing soaked feeds or having a horse that takes much longer to finish his meal than his buddies?
Certainly seems like not.
Pretty much everyone else posting in this thread, including a bunch of BOs/BMs, a bunch of people who are taking care of senior/special needs horses, have said that the extra work is a wash for the savings on the extra hay.
Wonder why you’re the outlying opinion?