First of all, this is great idea. Win-win arrangement deal. But one must consider its effectiveness (ie. how do you measure the return on investment?). I'm seeing the trend that online ads, banners are getting less and less effective as people have all sorts of ad blocking software on their machines, especially for Firefox user like myself - having an Adblock Add On installed, i don't see any ads whatsoever on any websites on the internet. Yes, the adblock is getting smarter and smarter guys. We really need to think ahead and look for a new way to get real value from marketing cost.