If I walk into a data center with an SP30 and say I need space for this, it's going to use about 3kw, they're going to say no problem. I walk into that same data center with a bunch of S3s and say I need space, they're going to look at me funny. Then they're going to charge me for custom space and setup fees and whatever else they want to handle my non-standard servers.
Why would you go to a non-bitcoin-mining oriented and ask for space? The very few datacenters that charge you for space also charge $0.2/kwh or more.
And even if they do charge you for space, those ancient DCs are only capable of cooling 10-20kw per cabinet so you won't be charged 2u per sp30.
My point in all of this is that from a purely hosting standpoint the SP30 is going to win. It's a single unit. It's a standard rack size. It's easy for the data center to deal with. I already gave the S3 the price advantage for up front costs. I did not amortize savings across the board, as that wasn't my intent with the comparison. I considered each bolded section individually, and gave the advantage to whichever unit deserved it for that section.
Yes, I think we all agree that sp30 is more efficient and more dense. It is also one of the best looking asics and comes with possibly the best customer support available.
But all that is pointless if it takes 30 months to pay off.