Only way to ROI is to somehow get that S4 out of the service or Co-Lo and into cheap or free hosted electricity.
Those hosting/electrical/maintenance fees kill ROI from the get go. If it's possible (not recommending this by any means), you could stash it in IT office datacenter rack or cabinet, and hope no one finds out. If you don't have access to this, then you're shit out of luck.
If you do have access to free/cheap electric, then get that miner up out of there, put it in the cheap hosting facility, and mine for a couple months, then resell that ish on eBay to some sucka....boom Profit!
That unfortunately maybe the only way you break even or come close to profit.
with 7 BTC (~$2200) I bought 8T at hashnest. They charge around 50% fee, my return is about .05 BTC/day = ~$17/day = $510/month. If I had bought the hardware would required 4 S4 @ a cost of $4800 and a return of about .10 BTC/day = 3 BTC/month = $1050.
Power wise I would be spending 5600 kw/h @ $.14 or $784/month for a net profit of . $266.
not counting diff increases my ROI at hashnest is 4 1/2 month, with hardware ~18 month. O yes, it pays to do cloud mining, just not at the ripoff scamers at cex.io
5.6*24*30*$0.14= $564.48 - very close to the hashnext fees (about equivalent to $0.12/kwh)
secondly, if you buy the S4 with coupons they are $800 each (plus shipping of ~$180). They have resale value even if not profitable.
