Final answer:
The 2016-2017 Student Injury and Sickness Health Insurance Plan excludes coverage for elective cosmetic procedures to maintain a good ratio of healthy people to sick people in the insurance pool and keep insurance costs down for everyone.
Step-by-step explanation:
The best reason that the 2016-2017 Student Injury and Sickness Health Insurance Plan excludes coverage for elective cosmetic procedures is to maintain a good ratio of healthy people to sick people in the insurance pool. Having a large majority of healthy participants in the risk pool helps to keep insurance costs down for everyone. If elective cosmetic procedures were covered, it could attract more healthy individuals and potentially create an imbalance in the risk pool, causing insurance costs to rise.