So how has this coin exploit effected you?

20-25 mil ->180 mil within a year. Insane profit. But I wouldn't touch these chaos. They are from an exploit, people got banned from the last one.

those 50% scrolls could be considered... no in fact they were an exploit because you obtained a different scroll than you should have obtained in the first place (The blank scroll), and nexon as a way of apologies for messing that, offered to exchange those blank scrolls for 50% 2h wep scrolls. When the Exchange started all methods of getting blank scroll should have been patched, but because nexon is nexon didn't look to patch the aran for getting these scrolls and mass abused started.

All in all what im trying to say is that those 50% scroll where also an exploit and no people were banned for it.