Due to the mark ups charge by ASIC manufacturers, economies of scale allowing people with deep pockets and ASIC manufacturers setting up large farms at a cheaper price than consumers, exponential difficulty increasing, and scams (pre-orders never shipping or shipping late, in stock orders shipping late, cloud mining ponzis).
http://bitcoindifficulty.com/What people are you talking about? It's like you are pointing at people, inside a football stadium.
If you are not specific the logic becomes flawed in the sense you are trying to generalize a person who buys 1 asic and a person who buys 1000 asic.
Buying an asic in 2014 and expecting a 90day roi is not realistic, for a person mining in there home at least, but it's realistic for someone who has a farm that has ROI'd.
Today, with this difficulty and this many manufacturers it's very rare. Unless you are not at home and already have an established earning income from previous investments.
You think someone with 15TH/s doesn't earn enough to re-invest in more efficient miners to keep up with the difficulty increase? The real question is at what point will the gigantic farms not be able to add 10PH/s to the network from their locations.
Making decent profit here running 100 T/hash.
Strato
Did you factor in the costs of the hardware and expenses? What manufacturer did you order from, at what price, how much is your electricity and operating costs (cooling/Internet/Ethernet cables/routers/PDUs/C13 to C14 power cables/etc), and how long have they been running?
Moar details please.
There are miners like him all over this forum. I am pretty sure he didn't buy 100th/s at once. You should check out the show your mining rigs thread there are plenty of nice farms there.
