If you are (or planning to be) at least yearly visitors at WDW, I've heard of this strategy before: buy the AP's for your vacation this year, and plan your next year's vacation just shy of one full year. So, for example, if you buy and use your AP for the first week of July 2016, plan your 2017 vacation for the last week of June, right before your AP expires. So, as long as your two vacations are long enough to put you at least at a breakeven point between the cost of the MYW tickets and the cost of the AP's (I think it's 10 days?? could be wrong), you could theoretically get "2 years" vacations out of the one AP, plus the discounts that go along with it... you'd only have to buy the AP's once every 2 years, but still get to use them yearly.
I've never personally done this before btw! Just thought it was a clever strategy if we were ever considering buying the AP's.