What is the return on cost for developers?

Could you elaborate on the concept of return on cost for developers in the context of cryptocurrency and finance? Specifically, how is it calculated and what factors does it take into account? Is it a metric that's commonly used in the industry to measure the success of development efforts? How does it differ from other financial metrics like ROI or profit margin? I'm interested in understanding how developers in this field evaluate the cost-effectiveness of their projects.