Given the amount of Kao coin bonus points I accumulate per day and how infrequently Kao coins are added, by the time new coins become available I inevitably have enough points to get all the new coins immediately, which cancels out the motivational aspect of it (the coins felt a lot more special when I had to actually work to get the new ones). I was thinking it would be better if the points could be more like the points for the manga, where you only accumulate points when there's something available for them to apply to, rather than constantly. That way if there are coins you don't have yet, you get bonus points, but if not, you only start accumulating them again once new coins are available.
Let me think on that! We've been putting so much time into other image assets (games, etc.), that we just haven't had time to do more than the 3 or so ones each month.