Yes, of course you can cobble something together when availability does not matter at all (it might blow the fuse in your apt, though;)).
I was just saying that in an application with most basic availability-requirements you're not getting the cost down like that.
I.e. even though you could fit that into one rack, nobody actually would (redundancy is measured in powers of >=2). And even though you might find an ISP who won't bitch about you drawing >10 Amps in "half a rack" (cough), you should still be a little concerned about other tenants screwing around in the same rack as your only copy of 80T of data that you care about... ;)