Thanks for your reply - it's funny because my comment, which led with a nitpick about the logic of "you spend x on y so spend p<<x on q", then apparently triggered a debate about whether people actually bought that much coffee :)
Maybe what I should have led with is that it would be nice (from my perspective) to know when your info most often leads to savings, so one can decide if that matches their travel needs/wants. It looks to be like you're targeting people who can be flexible about dates and destination; this is useful info to set expectations for how best to use the information