the "magic" of the hotel does not come from the master. the realm was designed by the gods to constrict and punish asterion and other potential prisoners. even if he wanted to rebel, the contracts would prevent him from taking action against the master. besides, even if he was able to, it wouldn't anything, the master is but a conduit to exact the realms purporse, which is fully capable of bringing harm to asterion without any master being present. in fact, the master may be one of the few protections asterion can have, as he was able to persuade previous masters to make the hotel and that protects him from the automated attacks the valley does to him.