It's really not the same thing Naunet.

The systems you just brought up are localized to the specific character and all data is equally alloted to ALL playera in those systems unless some one pays into the extra systems such as extra retainers for a premium on top of the sub.

In the case of housing how ever, both the avalable locations as well as the server bandwidth used to add to the housing systems are finite and there is by far no where near enough to go around. By my estimate (based on no solid data tbh, just a rough guess) there are easily more than 20 times the amount of players as plots. Even if all players were in the existing FCs on Balmung with out founding more there is still more than 10 FCs for every plot.