I have to say for me it was tuition and fees + the cost of living. I loved the school and thought that it had the best campus and learning environment for the students out of all the schools that I interviewed at. I was really impressed with everyone there including my fellow interviewees. I can see why this school is highly respected.
But I got accepted into my #1 choice, UT-memphis, so now I can pay instate tuition (13,000/yr) and stay at home for free thus reducing my cost of living for the first 2.5 yrs. If I had chose Colorado, I would have to pay out of state tuition which is 29,000/yr plus COL and the additional fees. I also will be declining Thomas Jefferson (#2 choice) because of the same reason; would cost me 26,000/yr + COL and fees. Hence why I decided to go to an instate public school b/c I will graduate with less debt.