Actually, this is pretty good. I was originally ready to give up, but now I see I can grind a low score of 14 points, 240 points in 15 days, with about 1u of wear per day. In half a month, I can also collect two or three times for a total of around 100u. There's no anxiety or sense of competition like when grinding for high scores; it's a laid-back way to reap benefits.