Of course its about the $ value
How would you feel about ROI on miner hardware if the reverse was true?
If you had paid 100 BTC for a miner when BTC was worth $100
You mined 101 BTC but BTC value dropped to $50
Would you say you have made a ROI?
Yes! More BTC than you started with is a profit. Less BTC than you started with is a loss.
Exactly. It's incredible how is so difficult for some people to understand such simple concepts: You are buying a machine that mines bitcoins. If it mines less bitcoins than you have paid for it (or that you could have bought when you paid for the machine), then you did bad.
So I paid 7000USD for a Jupiter and if by any miracle I mine and sell BTC for 14000USD then I did bad?
It depends on how many coins you spent on it, or on how many coins you could have bought with 7000USD when you paid for the unit.
Most of batch 1 customers bought their units in June, when BTC/USD was at $100, that means aprox. 70 coins per unit.
If a batch 1 Jupiter mines less than 70 coins in its lifetime then yes, batch 1 customers would have been better by buying BTC.
All the above is painfully obvious, and still some deny the obvious.