I like a higher protein intake, roughly 2g/lb LEAN Body mass, with a 40/20/40 split for protein, fat and carbs.
The only reason I can think of for not counting your pre/post is because those cals are being used both during the workout and after the workout to replenish what you lost and then some.
When I calculate my numbers for my diet I calculate my daily intake, which means that if I counted my pre/post as part of that I would be in a deficit on lifting days.
For example, my daily intake is 400,200,400 cals, for a 1000 calorie daily intake. So if my pre and post workout adds up to 100,20,100 cals then my intake for the rest of the day is now 300, 80, 300 cals, whereas on an off day I'm getting 400,200,400 and not using any of that as energy in the gym.
I know that is kind of a shitty explanation, but hopefully you get my point.