Gpotato is going for players with deep pockets. That's it.
Yeah the population is low but those who do play can afford big bucks. This strategy might not appear good from the outside since there is a low endgame population, but it brings in the dough and satisfies the shareholders. So in that regard they are successful.
Allods is NOT a f2p game. Period. They are people who will say otherwise, but either they are lying or they haven't gotten to endgame.