Priyasakhi is a movie with its heart in the right place - it's the brains that are not in the right place. The theme is incompatibility between a couple, and how a marriage breaks up. Now you understand. High on content, low on BO potential.
Like everyone knows, people go to films to enjoy themselves, not brood. They need to look forward to what will happen next, not dread it. The lesser the time that you keep a person depressed by what's happening on screen, the better the chances that he'll come out and at least not say anything negative.