one thing you are forgetting in this 7 store example of standard POS system, doesn't factor in if the restaurants even stay in business. if they open up and have poor service or poor food they'll go out of business. That means all of that upfront cost is LOST, sunk cost and no revenues to offset.
The LCRE model is grounded by the per ticket charge. Which means the restaurants cost is directly tied to their Revenue stream. Way less risky and LCRE's success is directly tied to the restaurant's success. This relationship (ongoing) will strnegthen the need for great service and a great service product for the restaurant to be using.
If the restaurant goes with LCRE and then goes belly-up, then they aren't out very much money at all. This sounds very attractive for new restaurants.