once u maxed it it will converted to strange stone .

100 moon coins = 1 strange stone

25 sun coins = 1 strange stone

the cap reset every weeks . what good when it cap it u will gain stats . From capping Sun scroll for the day you get +150 life, +75 attack, +75 ninjutsu

From capping Moon scroll for the day you get +50 defense, +50 resistance , but it will just last a week so if u cap every week it will basically become perma stats .