Because that was what the article you linked suggested. The $1.4 billion figure was the total cost for protecting the first family for the whole year, not just vacation time. I'd imagine, the cost for most presidents who remain in the white house and take an average amount of vacation days are likely the same, with a small variation accounting for any particular location.
So it's okay because Trump signaled that he planned on wasting a fuckton of money by staying in NY? Does the president not take on any responsibilities to mitigate cost?
Come on. His son is in his 30's. Are you really telling me that trump won't go to the white house because his son can't be that far away from daddy?
Let's be honest. Trump would just rather stay in his gaudy ass tower. I think a president should take on the responsibilities of his office. That includes mitigating security costs and staying in the residence that every single president has stayed in before him. He wanted this job, and his personal preferences need to take a back seat in some instances.