How can I make my dad realize I can't get into the colleges he is convinced I can get into..?

Why is this college so “desirable” in the eyes of many high school students?

THIS is why-
IT’S CHEAP!
2015/2016 Cal Poly Student Costs

Total Annual Tuition and Fees–$9,000

Total of “Price to Attend Cal Poly” plus “Other Estimated Costs” Undergraduate:
California
Undergraduate
On/Off Campus=$25,467

http://financialaid.calpoly.edu/_finaid/coa1516.html