Are you surprised by this? Median student loan debt of graduates is around $15k. Is it really that hard to expect some people to prioritize their debt to the tune of $6k/year?
My student loans were about 3x that, and since the interest rates were relatively low, I never prioritized them. It's been about 7 years and I'm still paying a couple of them. Really any of my other debts would be more profitable targets.