After having been in southern front since it released, and casually trying to get all the notes for completion, it wasn't such a pain because there was no reward. But after the bike was a thing I've been actively grinding it, and spending way too much time in there, attempting the duel, for it in the end, to be too much and I ended up feeling like I just straight up wasted my time spent waiting, farming and prepping for duels with notoriety and all. I've given up for now and hopefully they'll change something about the droprate, add a vendor for notes with a high payment of coins or something like others suggested in this thread. I can only pray at this point.