Unlike Engineering and other professions. MBBS is a professional course where in you do not have placements. You become a qualified and MCI registered doctor once you complete your MBBS along with internship. Hospitals do not visit colleges for campus recruitment. The hiring process is different in Medical field. And the employment sectors are hospitals which do not have a standard salary measure. It depends on the experience that you hold and the hospital setting that you are working. That is the reason why you do not have concepts of average salar, Rate of Investment, Placements, etc.