Defections from the most hard core elements of the regime likely have several overlapping causes: lack of adequate and timely payment; a demoralizing sense of disorganization and futility; fear for the future; and the need to attend to family. In addition, there is probably an increase in looting and corruption that signals it is becoming every man for himself.
The IRGC takes care of family first. They have dedicated housing districts for family. I would not be surprised if they also have dedicated shopping, schools and medical.