I've found that students who breeze by in these introductory classes have no desire to skip over them. Easy semesters are hard to come by. College students generally don't have the attitude of "I'm paying so much for this so I'd better get something worthwhile out of it". They are there for the paper, and they don't feel like rocking the boat. They know this and the system knows this. They are normally so inundated with work from other classes that they're forced to take as many shortcuts as possible.