I like the idea of the POI restricted to a sector. Maybe develop it a little though......
Unfortunately at the start players will look to see what POI's are in each sector and choose to land a new account in certain sectors.
Maybe rings of POI's - at band low 20's (where forgotten are level 20-250) there is one type of POI, at high 20's another and so on and only a mix at level 10-20 and 45+
Also, an idea to go with the original suggestion, a 'fog of war' where you can't see the rest of the world only the ring around your alliance's bases within 40 of each base. That way you'd not know where the POI's are until you start getting close.