It's because there is space....on other servers. It's a completely crap situation.
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Well, read their statements between the lines. They don't rule out adding more wards necessarily. But they've made it pretty clear it won't be a priority, and so any additions will likely be so few as to hardly matter on large servers like Balmung. My FC, fortunately, has a house. Sucks for those that don't, though.
Yeah... I am not sure why they think having the same number of wards on each server is such a prized ideal. But for some reason big servers can't have more wards than tiny ones.