If you're only in this for a month or so, trying to make money and move on, then by all means, worry about every dime and calculate every penny.
But if this is your life's work and you plan on staying the course for the long haul, then understand that building something takes time and is full of ups and downs.
A loss today does not mean you're doomed. It just means you get to work again tomorrow and keep building.
I would never chase short-term profit at the expense of long-term success.