I don't get why? I mean if you wanted to make money in the short term, neither a PhD nor admin are ways to do that. In the longer term focussing on the PhD increases your lifetime earnings. Either by graduating sooner, or getting better work out of it, or both.
As has been pointed out, the funding is more than generous enough to live on. Just focus on your PhD, and then get a graduate job if it is money you want.