Even if this is true(I doubt that it is. Few people only own 1 or 2 games for their console), this still illustrates one thing: owning 20 games or more for a single console, is
rare. Even owning 15 games is rare. 6.2 is very close to 0. Whenever someone owns 20(+) games, they are gonna pull up the average considerably. In other words, if this group was sizeable, then there's no way the average would end up around 6.2.
To illustrate: for the number to stay around 6.2 on average, you need 3(!) people owning only one game for every person owning 21. That gives you an idea of how absurd it is to suggest that it's
normal to buy 4 or more games per year, which was the root of this mini-debate to being with. Unless you belong to a relatively small group of gamers, a console doesn't need a massive game library as long it manages to churn out 10 or so games that peak your interest.
The link that
@Coxy provided effectively kills one of the main arguments against Nintendo.