We don't price the cars on the lot, but the prices are on the Internet.
The whole point is to make you have interaction with a sales-rep.
May of 2008 my General Manager mandated I put price hangers in every car. Let it be known the guy in general is an idiot, but he was the boss, so in the windows they went.
Sales dropped 25%. Not an anomaly, as I track results very well month to month and vs previous years.
June I yanked the signs out, and lo and be hold, volume returned.
It's not a bait and switch or sucker move. Although it does come in handy for the occasional dim-wit who is adamant his 6 year old Civic is still worth 10% more than MSRP on a new one.