Mario Kart was bundled. They count those as game sales. At the time the Wii was still selling well too.You can't compare Nintendo to other studios.
1)Nintendo games don't go down in price. Even used they expensive as shyt.
2) it's Nintendo. Theirs literally nothing else to buy on Nintendo systems then Nintendo games.
3) Nintendo games have always had phenomenal legs. Like a total outlier to the industry norm.
Also you're comparing to a total anamoly in Mario kart wii. Wii itself is an anamoly.
And really, games like uncharted don't have long legs. They just don't. The majority of blockbuster aaa's make 90% of their sales in the first 2 months.
*TLOU was an exception and did have crazy legs so who knows maybe u4 does the same.