I mean really.

The PS3 is out.
More technologically advance computers are out.
And they released FFXI on the XBox360.

FFXI (PS2 version) has been discontinued.
The bulky PS2 has been discontinued.
FFXI has been problematic for PS2 users and limiting to all players because SE still has the system supported.

What's the most beneficial reason that players want to still play on the PS2 version? It's been, what? Over 2yrs since SE started declaring that the PS2 was limiting their abilities to expand the game? That's more than enough time to build a reasonable savings to upgrade so the entire community could enjoy more content in the years to come.