Looks interesting. The Amazon S3 Glacier maths doesn't look right (outbound data is bigger than total price); but in any case, the "outbound data" only kicks in if you restore every piece of data on the drive, which isn't too likely.
You got me wondering what I'm paying. My S3 bill is US$10.60 a month; looks like I'm only storing 187GB though. 181GB of that is not Glacier stored, either - live-to-the-web cached image resizes. (Not bad storage after about 18 years using it. I rsync most of my filestores to it every week - non-destructive rsync which never deletes anything. Mind you, it's really very hard to find out exactly how much I have, and where.)
The "gotcha" with Glacier is the wait time for the files to be restored; otherwise, your 28TB is cheaper than $1day.