It's annoying, but I think that's (Willow and Tara dumping their financial troubles on Buffy) what the writers were going for.
Even if Willow and Tara had a job, which I don't think is canon, whatever they were making was not enough. Buffy was supposed to be in desperate need of money, to add to the angst. Her friends couldn't help her, because if they did, no money problems, less angst.
Giles did help her, but the money vanished somehow, maybe on the cheap clothes Buffy had (which were really expensive in RL), or food of the non DMP kind.
She couldn't get a better paying job, because less angst.
In fact, for the season to work the way it did, the only person that could have helped her and have it make a difference, would be Spike. Which, since the money would be gotten illegally, and they were in a mutuallly destructive relationship, yadda yadda yadda, would add to the angst.
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Even if Willow and Tara had a job, which I don't think is canon, whatever they were making was not enough. Buffy was supposed to be in desperate need of money, to add to the angst. Her friends couldn't help her, because if they did, no money problems, less angst.
Giles did help her, but the money vanished somehow, maybe on the cheap clothes Buffy had (which were really expensive in RL), or food of the non DMP kind.
She couldn't get a better paying job, because less angst.
In fact, for the season to work the way it did, the only person that could have helped her and have it make a difference, would be Spike. Which, since the money would be gotten illegally, and they were in a mutuallly destructive relationship, yadda yadda yadda, would add to the angst.
S6 = All Angst all the time :)