Do Lite versions drive sales?

If anyone is still wondering about the value of lite versions, check out this thread on TouchArcade, RE: Rope ‘n’ Fly and it’s #3 paid app ranking:

http://forums.toucharcade.com/showthread.php?t=18144&highlight=rope&page=3

Does anyone keep any stats on click through rates from a ‘Buy now’ type button in a lite application? I would imagine it’s easy to setup by having a server that keeps log of clicks coming from the app. and then forwards the user onto the App Store page.

Does anyone have a particular ad agency/service they can recommend for this?