How can $10 per TB not strike you as expensive? You can easily download that much a day on consumer broadband that will cost you far less than $10/day.
If you download the data twice at that price point, you could buy an HDD to store it for the same price (the bigger HDDs seem to be at ~ 18 EUR per TB here).
$10/TB is between availability zones in the same region. Egress to the internet costs $50-$90. So it's much more expensive than the already expensive $10.
