Sure, that's a great option for helping to reduce the cost for well-meaning general use, but the other way makes your costs 100% predictable, which is great if

Sure, that's a great option for helping to reduce the cost for well-meaning general use, but the other way makes your costs 100% predictable, which is great if you're on an academic budget (but, again, way more annoying for the downloaders unless they're also using AWS).