Factors:
B-titles: These games come out enmasse and meet the many different tastes of the market.
Shovelware: These games are usually geared towards kids and non-savvy gamers who want a specific action or gimmick for 20-30 bucks.
Casual titles: Games that the motivating family member can play with other family members (NES - Duck Hunt, Track and Field, etc.)
Value: NES had a great package, SNES had the name nintendo and a good package, PS1 was a game player and a cd player, PS2 had the name, was a gameplayer and a DVD player.
All of them (except SNES) had a pretty good selection of cheap games by the third year of the cycle.
People, unfortunately, want quantity not quality. Especially in America with the Wal Mart Shopping and the all you can eat buffets. (I live in the US)
I would cite regulation, but I know you will simply ignore it.
