Have you considered trying to find a former student who flunked out due to laziness, worked at a crappy job for a while, returned to school with a vengeance, graduated with good grades and now has a good job in his chosen field? I would invite such a person to be a guest speaker in my class to help my students understand what is at stake and what college can do for them. Of course, allow for plenty of time for Qs and As. It's worth a try! Also, raise the issue at a faculty meeting to get some creative ideas from your colleagues.