1. It really isnt a city just like Kavala / Pyrgos / Athira / Sofia. There are legal ways to make money around those Cities. There is nothing to do at Therisa other then Drug runners and picking some barley.
2. Who cares if 15 rebels are added if only 2 of them are viable to get to and from in a reasonable time. Im not spawning Sofia to get geared at a rebel to pull a helicopter to land at drug runner and then pull a car just to fight a cartel.