There should be a way to send customers to different one-click upsell/downsell/cross sell offers depending on their actions within the funnel. For instance I have a main offer, a bump offer and an upsell. If someone takes the main offer but not the bump offer I'm going to show them an upsell with one price point, for someone who takes both the main and bump offer I want to show them an upsell with a different price point. And then depending on whether or not they take the upsell will determine if I send them to the cross sell. Salesforce calls these offer chains and each 'step' allows you to send your customer to a different step depending on what they choose. If "yes" then "this" if "no" then "that." This is a BIG one for average cart value, which is crucial for optimizing ad spend.