How to calculate value of a masters?
If your goal is to be a CTO (i.e. more business oriented) then the value of an MBA would be an idea worth considering. Once you reach a certain level of experience, education becomes icing on the cake. So in ten years time, if it came down between you and another candidate for a CTO position, and you had an MBA (or another master's degree), you would more than likely get the job.