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If you purchase it with a Kit then the license is good for one year
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I don't understand, the pricing doesn't make any sense to me. According to Altera web site, a Quartus subscription has a yearly cost of $2.495. Add the NIOS subscription and the yearly cost is almost $3.000. OTOH, the Nios Kit costs $995.
Why would you pay $3.000 per year when you can get the same by buying one NIOS Kit every year, at less than $1.000? Plus you have a new hardware kit every year, which I guess you eventually could use for decoration purposes :)
Of course that there is a difference, the subscription doesn't expire as the kit license. That would make a difference if you want to purchase the license one. But if you plan to mantain a subscription, then it doesn't make any sense to me.