How poor do you have to be that you can't afford coffee? Maybe not the $5 a cup starbucks bullshitaccino, but you can get a cheap electric drip pot and a month's worth of grounds for $20.
Of course, that presumes they either have skillz or some willingness and ability to get them. These days, a lot of people seem dependent upon microwave meals and fast food.
No shit, I was one of them. But we're talking the kind of money you can make in an afternoon of unskilled manual labor, to set you up for a semester's worth of coffee.