You're talking in general, and most of your points are correct, but they don't apply to our business fully. For example, our newsletters are always offering a

You're talking in general, and most of your points are correct, but they don't apply to our business fully. For example, our newsletters are always offering a time-limited discount for the purchase. They're also not segmented out to people "most likely to purchase", because we don't have that data. It goes out to 100% of our audience every time, unless they made a very recent purchase. If we knew who the people are that are most likely to buy, it sure as hell would make the business easier to run.