> Internal politics are much more likely reason why they do not walk away. I think I need to add a couple more possible reasons here. One is that your customer

> Internal politics are much more likely reason why they do not walk away. I think I need to add a couple more possible reasons here. One is that your customers know at that point how painful project it was to just make a decision on the vendor. Likely just that part of the project took years. They are very reluctant to start that from the scratch. Second one is that they very likely already have a good grasp on the competing vendors. Almost surely they were evaluated during the process you were selected. And they were not chosen. Either they were much more expensive or your customer is even less confident that they could deliver something in time. So they are stuck with you. And pissed. And of course, the requirements were written in committees after committees where everyone had more important things on their mind, so they should very much be pissed at themselves, but I think that level of self awareness is quite rare in the decision making bodies.