A friend and I considered getting married for a similar reason. We actually both were receiving Pell Grants, but married students are allowed to live off campus and drop the meal plan, which would have saved us another ~$7,000 each (mostly in loans).

As far as bad plans go, it wasn't exceptionally terrible, because we actually had an exit plan. Wisconsin allows you to annul a marriage if you haven't consummated it after a year. (I might not be 100% correct on that point, but the law was something like that.)

Pretty glad I didn't go through with that plan.