Launching ads during Oprah, Ellen, and Friends re-runs is sufficient for casuals, Nintendo has shown. Consistent continual advertising on Nickelodeon is sufficient for kiddie minigame collections, Carnival Games has shown.
If the ads aren't hitting Spike TV, USA, Comedy Central, Discovery Channel, History Channel, Fox, E, Tru TV, the WB and whatnot like the xbox/360 game commercials do, it's not real advertising designed to reach the non-casuals.
Word of mouth doesn't work for non-casual games anymore, ever since Wii invented casual gaming. Since casual games do sell on Wii by word of mouth, the non-casual gamers will only buy games based on marketing, hype, and review scores to differentiate themselves as seasoned educated customers.