Okay, you're all gonna gang up on me, but I hope not. I'm in business also, and the stipend I receive is in the mid 20s. I'm also holding various TAships (beyond my requirement), so I get money from those jobs as well. In total, I think I make around 40k a year. Don't get me wrong -- I work hard for it. I manage my time very well (I like to believe), and so despite my numerous TA jobs, I'm also above average on my academic/school/research side of things.
I have several student debts to pay as an undergraduate, and I pay all expenses myself. I don't know about you guys, but in my program, some people had previous full-time jobs, or they have parents who help pay for airfares and "gifts" like laptops and bicycles. I pay all of these things myself. But then again, I started teaching piano to kids when I was in high school, and I've been relatively financial independent since then, and I've been taught (through family values) that I have to work for what I receive, and I like to believe that my 40k is justified based on the (quality of) work that I do.
I think this depends on the school/department, but if you can seek other TA/RA jobs beyond your requirements (or even beyond your school), go for it. I truly don't believe in the "I don't have time" crap. I really don't. You just need to learn to better manage your time, not hang out often (not insinuating that all of you are drunk everyday though!). I take more courses than my peers and also work more than my peers, but I still can hang out with them when they suggest things.