I don't think that the sales of the PS2 version of FFXI is an error. The PS2 version never really caught on like the PC version did and MMORPGs weren't as big in Japan at the time as they were in other countries like South Korea. If I remember correctly SE was losing a lot of money up front when they launched FFXI as they didn't have a large user base and they weren't planning on making money off of it until it was launched in more markets, like North America.