a quick question about school

[SUFFER]

why is it if in college you fail a class they dont give you a refund ?
if i payed to learn and the teacher didnt teach me anything i should get a refund right ? i mean if i bought a tv to watch it and it didnt work it just played sounds they would give me a refund , or if there fuck up my food at a restaurant yea ,but higher education ,shit with some of these professors nowadays im taking a bigger gamble in school then at the damn casinos , any opinions
?