Hello... I would call it an exploit of course. I will just explain it in this steps:
1. You put X number of OPs in a level 1 account
2. Relog in the account, so you get an item called Premium Coupon (Wii) replacing the OPs
3. Send a support ticket for AeriaGames asking them to give you OPs back instead of Premium Coupon (Wii)
4. Keep sending tickets every weeks saying you want OPs back
5. They will ask why you have no Premium Coupon (Wii)
6. Say you didn't know you had to write support ticker before you throw OPs to floor
7. Congratulationz, you have X number of OPs profit every week!
Skype: bluevengeace
If you have any doubts, need further assistance, just contact me in skype.
I was going to sell it, but as it is simple, easy and fast i will just give it away till it gets fixed.
It is harder than it seems some times, so if you need help to deal with Aeria Games i can take care of it.
Good luck with it and Have fun making free OPs