Your numbers are basically fine for what you're measuring, if you round up to factor in actually having servers to put the storage drives into. So 40-50k instead of 36k.
The issue is your budget is for 400TB of data but minimal requests per second. That's a valid thing to consider, but it's extremely apples and oranges to a fleet of 75 high powered servers.
To put it a different way, their prices are pretty high but the calculation of powerful servers costing 40x as much as raw storage isn't "insane".
Your numbers are basically fine for what you're measuring, if you round up to factor in actually having servers to put the storage drives into. So 40-50k instead of 36k.
The issue is your budget is for 400TB of data but minimal requests per second. That's a valid thing to consider, but it's extremely apples and oranges to a fleet of 75 high powered servers.
To put it a different way, their prices are pretty high but the calculation of powerful servers costing 40x as much as raw storage isn't "insane".