[quote name='camoor']"Those censors" are typically big box stores like Walmart that won't sell r-rated games, thus dooming sales targets.[/QUOTE]
Wal-mart sells M-rated games--which is the R equivalent.
Pretty much no where will sale the AO (Adults Only) related games--equivalent of NC-17--so Wal-mart and the other big box stores aren't alone in hampering those games. Even the game stores won't carry them.