Remember that the fastpass system was completely opaque, you put in your tickets in the fastpass machine, and it gave you a fastpass ticket and timeslot. Everyone with normal tickets were told they could only have one fastpass at a time, so if you put your ticket in again, or into another fastpass machine, you'd get denied.
But they knew the ticket numbers of people staying in the right rooms, so they could have the system work differently for them, and hand out as many fastpasses as they liked. And the people staying in those rooms generally didn't blab about all their perks.
And the general public was used to a small trickle of people passing them in the fastpass lane, the number of rooms that had more fastpasses than normal was limited, so regular visitors would pretty much never figure out that certain guests pretty much always used the fastpass lanes.
At the resorts e.g. The Polynesian or Grand Floridian, like most mid-rangeish hotels, there’s a “club room” lounge area that has an assortment of complementary drinks, (beer?), (breakfast?), snacks and hors d’oeuvres