Not sure if anyone besides me cares, but I've been trying to track how many ratings games gain from their Plus exposure. Haven't been doing a great job of it, but I think I've started to stay on track. Anyway...
Demon's Souls
Day Before Going on Plus: 360
Finally Off of Plus: 4241
Vanquish
Day Before Going on Plus: ~450 (Relying on my memory for this one)
Still on Plus, But Almost Gone: 2250
Sleeping Dogs
Day Before Going on Plus: 427
Now, One Day on Plus: 1600+
Hopefully all these ratings are just 1/1000th of the people that are downloading them and enjoying them.
Also, to put some of this into maybe some perspective, there are only a few things on all of the PS Store that have 10,000 ratings or more. So I'd say 4,000 for Demon's Souls is preeeetty good, but 2250 for Vanquish being up for three months now is downright sad. Shame on all of you! SHAME!