Your profit margin is acceptable with a $2 sammich, and by selling 2 for 4 you sell twice as manny sammiches. Sometimes you'll take a loss to maintain cashflow because it will strengthen your credit which you can then leverage for greater income potential, and make up the difference with a greater margin in the future. Remember that these franchises are in the real-estate business, which is often leveraged in the management of these poison factories.
In other words, sometimes you need liquidity to keep the lights on, and are willing to take a hit to get it, because you'll make it up later with other methods. Such as increasing automation, or whatever.
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