Often, customers don't see the consequences of "small" changes that they'd like to see. At AOL we had so many people giving feedback on products that it became a customer support issue. One solution proposed was to have a dummy site that allowed users to move elements around. Whenever they moved something on the page (or dragged/dropped from a dynamic list of popular suggestions) they'd see the consequences in real-time. Big bold messages declaring all the changes that were just made would make it obvious that they need to think through their ideas.