So no Roi possible even with these miners ?
No way, unless your landlord or someone pays the bills..
Okay come on. This is why so many rookies turn away from Bitcoin and all the cryptocurrency..
Look here's the truth, no one can "predict" exactly what difficulty we'll be at in 6 days, 6 weeks, much less 6 months. Yet, there are two ways to make "profit."
One is to simply buy the bitcoins, and wait until the price goes up. Just remember, in 2013 BTC was at about $12 per BTC... Some people made some SERIOUS profit when they purchased bitcoins before they were even in the double digits.. So, it's still possibly to do that, but obviously the return wont be as great because the current BTC is at ~$385 USD.
The other way is similar to the above one, except that this is what we've been talking about. Mining you bitcoins. Simply get an ASIC that has good wattage/gh (usually anything below 1.0 watts/gh is acceptable, the newer ones can range from anything 0.5 to 0.8 watts/gh). This is CRUCIAL because someone has to pay the electricity bills right? Nobody gets "free" electricity. Even if you install solar powered or even wind powered, you'll have to pay upfront for this & maintenance, etc. But, the thing about mining is that you can keep getting Bitcoins. That's how mining and purchasing are different. And if all else fails you can sell the miner, and make a little extra down the road
So, obviously, no one can tell you when you'll hit ROI, if BTC will go up or down, heck back in 2013 (about a year ago) the big players, BFL, KNC, etc. did "pre-orders" jesus was that a scam. Honestly SOME companies kept their promise and delivered. those that got their ASICS first got the big profits.. If you could afford those prices. KNC for example made some of the most powerful miners.. except they've had a serious issue, and still do to this date, with the ASIC cores.. they say that anywhere withing a 20% failure of cores is "acceptable"...
Anyway, it's up to you how you play your game. But I can tell you this, with a pretty good certainty, you won't make your ROI with an ASIC at this btc price. Specially because you won't pull your BTC every hour and sell it for USD.. Pull the BTC away from mining pools (thumb rule) and keep it in a (preferably software) BTC wallet, and as I said, wait for a spike