Probably because if they did point that out, the whole legitimacy of the mock-up drawing would be questioned.
I did see some other sites hide away the sketch xD
Your My Nintendo gold coins now count for 12 months
That's good since i got lots of them but nothing to spend it on :).
Yippie, keep saving them up for another extra 6 months and not offer anything worthwhile.
Just like my soon expiring platinum points which I can't spend on anything since I don't have a 3DS.