because students need the best possible education in order to get by in a global marketplace and with that degree you can help them get it ... because you want to be able to evaluate and implement the most effective curriculums and instructional methods available to students ... would you also be designing curriculums and instructional methods with a Ph.D.?

(let me go dig out my essay from when I was applying to the MSN program and see if there is anything in it that might be helpful)