They're selling at $4600 for two units, so $2300 a pop. Earning is around $24 a day, so break even in a couple of months. Why is everyone saying they won't make their money back?
They sold them $7000 each just recently. Decred hashrate has tripled since. Guess what happens when all those $2300 units hit the network. They will keep selling them at $500 then.