These machines have only been running for about 40 days in our farm,
Just as I speculated, about long enough for manufacturer to ROI the machine. Nice business model, they basically get paid twice for each machine.
Thank you for stating it publicly, now if only you'd price them to reflect their used nature!
in 40 days S5 produces just ~$130 minus electricity (has to be at least $18.48 if the cost is 3c/kwh), so no more than $110 produced.
It could pad the margins, though.