As mentioned, FFXI was anything but 'low sales', it bankrolled the company for quite some time.
Can't stress this enough. If ARR hadn't been profitable at launch I suspect the bean counters back at SE HQ would have called in time on the 3 month content patch cycle rather swiftly or cut back on the staffing at the very least. As is with it turning over more money than expected and with several nice little cash cows yet to be offered up to the plate (PS4 release, ARR Soundtrack, Mog station Fantasia etc), it's fantastic news for us as I suspect YoshiP will have little trouble getting all the resources and manpower he needs for the content team.