I think you missed the discussion (maybe it was in the previous thread of this topic) where we already discussed how much was spent on advertising, and other non-production expenses. Someone said it was around $170 million I believe.
We also already discussed how much money the film has made when you include product placements, merchandise, and other non-production related revenue. I believe it's around $150 million.
So basically the non-production expenses and revenues cancel out give or take ~20 million. Thus, just using the basic formula of Box Office - Production Budget is completely valid way to measure the success of the film.
Now the revenue-sharing deals that WB has with other studios (like Legendary, Synecopy) is another topic, but considering that WB just severed ties with Legendary I think it's pretty obvious that a sequel for MoS is going to happen at this point regardless of the final BO numbers; which basically everyone on SHH is in agreement will be at minimum $600 million WW. Some say $650, others say $700, others say $750, I say $800+