Drag-Theseus said:
agree.. I have few farms who are lvl33-40 with good storages. everything under those levels are low with storages and there is no use of them (except for those who are doing siege quest)..anyway..completely agree
I was originally going to say less than level 50, but I realized that for newer players starting out, having a variety of level 30-50 abandoned cities around is helpful for them. They benefit raiding when you are only gaining 5k to 20K a raid. And as you mentioned, some lower levels are great raids if they have storage.
I wonder if Plarium actually checks the storage capability of these cities to determine if, "yes this ones good for active players, so well keep it", or "Nope, this ones absolutely useless to keep on the board." I imagine it would be easy for the algorithm to filter cities in that manner.