I understand. I think you said you have free electricity too. I don't know how technical you are though. If you know you are going to have to spend +/- 20 minutes a day and occasional downtime to make these work and think that lyra2rev2 will stay profitable for at least 6 months (and the coins won't fork) then go for it. But it is a high risk type of decision.
I purchased 6 Z9 minis with the first and second batch, and they have almost paid for themselves and could still sell them if I wanted... so sometimes it works out. Maybe this one will, maybe it won't but I am banking on bitcoin (because I use nicehash) going back up in the future so that will help my overall profit.
Thanks for this feedback, what daily profitability are you getting from the Z9 minis? The price has dropped and Bitmain has them for $630 + $100 for PSU and delivery. I can get 4 or 5 of these hence the question.
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I have switched from Nicehash to prohashing, and am earning between $5 and $7 per day per Z9 mini in BTC. My wife and I were mining Zen for the last month, but decided to switch for simplicity. So it is ROUGHLY a 120 day ROI at current returns, which is not quite as good as the Z1 if it works properly, but better than most.