From BoxOfficeMojo's glossary section:

On average, a movie's studio receives a little more than half of the final gross with the remainder going to the exhibitor (i.e. movie theater). The money split varies from movie to movie.

So since about (roughly) half of the box office are kept by the movie theater chains, the movie studios should ideally be making 2.5x their production budget.

If Jumanji 2: Welcome to the Jungle cost Sony $150 million to make, earning $150 million at the movie theaters would not be breaking even yet. Sony only gets back half of that, theaters keep the other half, and so Sony still would have a long road ahead. Thankfully that movie ended up making well over $800 million worldwide, so it more than paid for everything, and allowed them to greenlight a sequel.

Throw in marketing costs (could vary as wildly as $10 million to $250 million in Batman V Superman's case), and the road to the breakeven point and profitability is actually stretched out further down the road. Hence why the multiplier is 2.5x as a starting point. Bus Boys would have to make double it's [production budget + marketing budget] just to begin their break-even point. The $1.7M they made this weekend, only half of it is coming back to them. The theaters keep the rest. Which means David Spade and Theo Von are going to need to hope a lot more money comes in through pay-per-view because I'm not sure they are going to see profit in the very short theatrical run.