Not possible unless you ve got really, really cheap electricity.
Cause there s nothing to prevent people to buy 120000000 rigs by mid 2018 and bring you out of business. We ve seen this before, in 2013/2014, market gets saturated and everyone shut down their rigs. The ones who remain are people with 6 cents per kwh and lower.
not true you can do good with 20 cent now and more, in 2018 the profit will be much higher, so evne with more gpu there will be the same profit, while it's easy to double the gpu when they are few of them it's more difficult when you have millions already o the market
In 2018, unless coin prices rise a TON, profitability will be very low indeed as ETH takes steps towards PoS driving MILLIONS of GPUs into seeking new homes and driving profitability on THOSE coins down a ton.
This doesn't even factor in the number of folks that are deploying or going to deploy new rigs between now and end of the year.
You can make good profits RIGHT NOW, and for the last 2-3 months, at 20 cent electric - but don't COUNT on that lasting even TO the end of the year much less past it unless prices go up a LOT.
Keep in mind that the only REAL limitation on rig growth RIGHT NOW is the worldwide GPU shortage - otherwise profitability would ALREADY have dropped a ton - oh yeah, it already HAS dropped by over half on almost all coins in just the last 2 weeks or so DESPITE that shortage.