Surprising Nintendo Channel data (UK)

[Gamerace]

Declan said:
No, there's no way of knowing for sure, and as I say, second-hand sales (which ELSPA don't track) must play a part. But with some of these titles (e.g. de Blob) I don't see much reason why the percentage of owners sharing their data would be dramatically higher than the average.

Like I say - ball park figures with big margins of error, but figures based on some data nonetheless.

Don't know about the UK but in NA you have to consider rentals too.  Probably half the games my system is pulling data for were rented (or borrowed) games and that totally skews those numbers.   Sadly, on the flip side, a lot of those rentals have more play time than some I own!