Depends. Movies are often much cheaper the first week they come out (at least at Wal-Mart.) The same with hard-bound books if they make the bestseller lists (again, at least at Books-A-Million.) I'll pick up either initially if I'm interested, but some (most) books aren't worth full hardback price to me, and some I'll only pick up mail order or at the used book store. And some movies aren't worth picking up until they hit the $5 or $10 bins.
Games on the other hand I never pre-order (they might suck) and almost never pick up at full price unless it's something I've been waiting on (Half Life 2, Doom 3, F.E.A.R.) and then I don't mind paying full price to support my preferred style and quality. Otherwise I'll pick them up for $10 to $30 depending on how fast they drop, what I've got stacked up waiting to be played, and how much I want that particular game.
Waiting for a prostitute to drop in price, though - that's just wrong on so many levels.