Don't Track Dirt Onto My Dirt!

Last night I saw a commercial for the Woolite RugStick - a cleaning device for carpets. it featured a woman who wouldn't let her friend come in out of the rain because she suffered from "dirty carpet anxiety." This would have been an effective example of someone being such a paranoid clean freak they won't let anyone walk on their carpets, except that the commercial had already shown the carpet to be very stained and dirty. And that makes no sense to me. If your pristine white carpet is already stained with tracked in dirt, then what's the big deal? Shouldn't you have made your friends stand on the porch before they got your house all dirty? Doing it afterwards seems like a pretty stupid plan to me. Especially when, according to the timeline on the ad, you are planning to clean right after your friend leaves anyway. And of course there is always the common sense fact that if you suffer from dirty carpet anxiety what you need is not the RugStick - it's hardwood floors. And maybe a psychologist.