Your extension changes the analogy. One person clicking on something relevant to their search is different than one person clicking on X relevant searches. The

Your extension changes the analogy. One person clicking on something relevant to their search is different than one person clicking on X relevant searches. The "chances" of an e-mail reaching X number of people entirely depends on the e-mail list you've compiled. The company I work for sends an e-mail every week and it reaches over a million people every single time. Even if you make a 1% conversion on that list each time, you are showing continual and repeatable return, which some call a "business model". A lot of us get caught up in the fact that this model has nothing to do with the actual product.