Productivity on price comparison sites?
 

What is average productivity on price comparison sites like shopzilla.com? I mean how many times one visitor clicks "go to store" link at average?
I understand that it could depend on variety of factors, but I'm sure that this metric is not varied a lot from site to site. It's like productivity on mgp's which were about 250% +/- 50%... 5 years ago:1orglaugh