It works like this. It is saying that per month you pay less. So if you set yourself in for 180 days or 6 months, you pay 13 a month instead of 15. You'll probably end up paying 78 dollars up front which would have you save money over time. But that's for the better servers, if you are just getting into the game I'd suggest entry level which is even cheaper but only 1 character per server. That said I'm no FF expert so something else would have to help you with the specific differences of the servers, or rather whether or not it's worth getting. I just know basic MMO pricing. Entry is the well, entry level and it's just 12 a month. Standard is a bit better and it's basically a month 15, 3 months 14 a month, 6 months, 13 a month. Almost certain you pay these up front but it may be ala contract-esque where you will automatically be charged the price monthly. My money's on the former.