It gets far, far worse. Think about rent and cost of living.
I attend a law school that costs ~$1,000/credit hour. That works out to $36,000 year, full-time, in tuition alone. Furthermore, students enrolled full-time are not allowed to work more than 18 hours/week. And although you may think a JD candidate could make a fair amount of money, they don't. You're looking at the same $8-10/hour pay you could get as an undergraduate, except now you're clerking or doing paralegal work.
As you'd expect, law school is far more academically intensive than your average undergraduate program. The rule of thumb is that you'll spend a minimum of three hours studying for every one hour of class time. On a standard full-time track, that's 12 credits per term; 12 hours per week in every class, another 36 hours studying. So, 48 hours/week devoted to academics. Let's assume that you get a job at $10/hour, and work the full 18 hours/week. That's $180/week, or $720/month.
The short of it is that any job you get as a full-time law student isn't even going to put a dent in tuition costs.
But now, add, say, $700/month for rent. Then you have bills. And food. And transportation. Let's say the student's frugal, and he gets by on about $1200/month (obviously this varies based on where you're living, but I'm trying to pick a number that would be typical of a suburban law school). And upwards of $5000 worth of books every year.
So... add it all up.
Rent, food, bills, etc.: $14.4k/year
Working income: $8604
YEARLY TOTAL: $46,796
TOTAL TO GRADUATION: $140,388
Now, consider the time constraints.
1 week is 168 hours.
You're spending 48 hours/week in class or studying.
You sleep 8 hours/night (or 56 hours/week).
You're working 18 hours/week.
That's 122/168 hours per week spoken for. That leaves 46 hours/week on average for leisure, additional studying, eating, and transportation time. That's almost 7 hours per day. In my personal experience, it's about 2-3 hours/day for relaxing and/or working out. It's not an impossible task, but it's stressful, and not fun. But going tens of thousands of dollars into debt for the "privilege" of being too damned busy all the time isn't much fun. Clinic and volunteer work - both of which the school pushes pretty hard - all come out of this time, too.
Thankfully, I'm at the school I'm at (as opposed to a more prestigious one) because they offered me an enormous scholarship. But I have friends that are borrowing their whole way through. One of them half-heartedly jokes that the only way to get through it is to pretend that loans aren't real money, because the debt is otherwise just stifling.