Starting on April 7, 2014, any newly registered Nintendo DS or Wii games (both retail and digital copies) will continue to receive product registration surveys, but no longer be eligible for 10-coin post-play surveys. In addition, starting on April 7, the deadline to complete newly earned post-play surveys for all games will be 30 days after they are issued.
Where I found this:
https://club.nintend...ble-products.do
other article:
http://www.gamezone....10-coins-poorer