Been playing for nearly 9 years now, I think it's more habit than anything else. Well also it's the people you play with too. When you've played with a lot of the same people for 5-9 years and have become very good friends with them then it's hard to just quit knowing that you're cutting off your main point of contact with those people.
It's not like I have anything to accomplish in game. I have multiple Relic weapons. An Empyrean weapon. Tons of top level jobs. Nigh on perfect gear for all my jobs. I've killed every mob in game and am like sat on a ton of gil with nothing to do with it. So yeah, it's basically just the people I log on for now.
I mean some of these people came to my wedding and we've done regular meet-ups. Hell only this weekend gone I travelled 9 hours to go visit one of the guys I know from FFXI and we went on a 3 day drinking session lol
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Crucifying my Oracle average one match at a time