I have a few different asic miners, from various manufacturers.
I have yet to recieve any hardware that can not produce more coins vs electricity cost if thats what your asking?
I guess it will be unprofitable if your electricity cost is more than what your machines can earn?
Been very fortunate to recieve orders of hardware that has ROI already long ago, and im collecting free coins daily from them now. Also have machines running that has not yet hit roi, but gpus do have resell value
From my short experience so far, coins are accumulating daily and heading towards roi in due time, some batches taking longer than others.
One thing to remember is to NOT buy from resellers with a super high mark up price. For sure that will never be worth it. I also use fiat to purchase my orders, and hold on my rewards for long term. So that also helps.
100% TRUE.
Put your feet on the ground, 3-4 months for ROI is absolutely amazing, we cannot become rich buying a miner, the best way is to reinvest again and again and again..... if I get 300$ bucks/month/miner i'll be the happier man around the world.
I've bought 4 1080TI for mining ZCASH in July and the ROI is calculated in 6-7 months.... , the actual numbers for a dash miner are very good if you bought to bitmain or baikal directly, not resellers.
A lot of miners received this week. A friend just received 1 yesterday.