How does an outsourcing firm survive and grow? Obviously, they have to build good relationships with customers. Here are some other factors behind outsourcing:

Most vendors want to build long-term relationships because of the cost of starting up the relationship and building ties. This is especially true in some countries where cultural factors dictate that it takes substantial elapsed time to become familiar with another firm.

Technical vendors see your project as a means to build their capabilities to market to other firms, including your competitors. You should always assume in an international project that the firms will immediately begin to market to your competitors after they sign a deal with you. For political vendors, the situation is different. You will likely select the vendor based on political and cultural factors. This evaluation will be very subjective.