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There's a certain amount if overhead involved in creating an AP of any length. Things like devising the story arc, recruiting writers, crafty specialized rules, and anything else unique to that AP.
With two APS per year, you have to go through that overhead process twice. With three APs, you'd do it three times, a 50% increase in overhead. Even if APS were shortened to three or four issues, there's no way it would be less work for Paizo to produce. At least with two APs, they know year-to-year what their overhead looks like. Going to variable AP lengths would make the overhead harder to manage.
They already seem to be at their limit. If they did this, the price would probably go up too.