Don't forget you have to buy books, etc., and they cost "a couple of hundred dollars" too.
When I was an undergraduate I was definitely on a knife's edge, but I also often had cash in the bank because I got a big cash infusion annually. I just had to live off a very strict budget at that time to make sure the money would last.
I wouldn't have wanted to rely on this service when I was a student, especially at that cost, but in a pinch I could see situations where it would make sense.
It would have been nice if I did though.
People going to university like to talk about how poor they are, but they're obviously not "can't manage a couple hundred bucks for college" poor. I've known a lot of constantly-bordering-on-homeless people, and they're usually lucky to even manage community college. UW is $13k a year just for tuition.
Sure, but if you don't have "a couple of hundred dollars", you don't. It's a bit like saying "Why are people poor? Just put $1 million into a savings account, then you'll get enough to survive each month". Great for the ones who can, irrelevant for the ones who can't.