> The moment that you store that URL in other service, a number of those tags become incorrect anyway (it is not an email anymore), and the stats you will get from it will be tainted.
It sounds like you're probably misunderstanding the actual use case involved.
If you're a business, paying for traffic, you want to know ROI. If you spend X dollars and get Y visitors which make you Z dollars, you want Z > X, and you want to know what the relationship between the three values are, to know if spending more would be worthwhile. You don't actually care if the human being who clicked the link was currently in their email, rss, or anything else. You wan to know "spending dollars this way resulted in this profit". You want to identify the source, in your dollars, of your income.
It sounds like you're probably misunderstanding the actual use case involved.
If you're a business, paying for traffic, you want to know ROI. If you spend X dollars and get Y visitors which make you Z dollars, you want Z > X, and you want to know what the relationship between the three values are, to know if spending more would be worthwhile. You don't actually care if the human being who clicked the link was currently in their email, rss, or anything else. You wan to know "spending dollars this way resulted in this profit". You want to identify the source, in your dollars, of your income.