I've probably spent < 1 hour waiting between strat battles dueling, and I have ~350 points this evening. It seems a bit too fast and fleeting TBH, I think it would be better if the duel system was a bit slower progressing up or down, so it doesn't represent a flavor of the week but more lasting standings.
Also I do agree it would be nice not to have ranked duels...especially if you're trying things that are new or deal with people who won't duel you when you're burning time.