Why is this so call Great College not paying Profe...

Why is this so call Great College not paying Professors a decent wage? ? ? I think speaking English fluently and clearly understandable isn't to much to ask in a professor for what we are paying to send our kids to college. Son #1 was on the Deans list at Tech his only gripe was some of the Professors were very hard to understand and at times couldn't understand questions asked in English he said he just taught himself, spent many hours in study lab to make up for the deficit in Professors. The valedictorian of his class left after the first year saying "to many professors were hard to understand" Now son #2 is going to Tech and he said his calculus Professor has only been in this country a year and is very hard to understand, that she copies lessons out of the book onto the board word for word then gives tests that are not anything close to what was taught in class.