By: Addison Wylie Adam Sandler has developed a foolproof plan.  It’s a movie formula that enables him and his friends to take luxurious vacations while making a movie in between excursions.  The baffling part is that even though these recent flicks get slammed by critics, they manage to make a lot of money.  I’m unclear as to if the film makes a profit, but it must be a good sign if Blended marks Sandler’s fifth…