Good idea G-Man. My only suggestion would be, rather than renting them all, why don't you just slip them in when you see them on the shelves? I mean, it'll definitely save you money. Also, the rental store might check the movie or box before reshelving, and may disgard the slip. If they're already shelved, then you have nothing to worry about.
Congratz on 10,000 Warrick! I had my whole family sign!
-Matt