Oh it's the invisible hand of the market.... puppeteered by noobs who can't use a calculator.
Reasonable ROI on mining equipment is 3 months from date of expected delivery, with highly inflating difficulty accounted for.
If we nailed the difficulty to 1.7 Billion right now, you'd make 0.0025 a month with a USB block eruptor, therefor in a situation of stable difficulty 0.0075 would be TOO MUCH TO PAY FOR IT. If you got one tomorrow you'd have a hard time getting 0.005 out of it ever in the real word ..
It is completely insane to pay more than $10 for one now, even if you think BTC will hit $50,000, use the $10 to buy 0.01 of a coin!
If, son,
if. If bitcoin hits $10,000 those BE are no longer mining dust and thus are worth more. Nobody is going to be selling a block eruptor for $10 when it will mine $10 in a day after the exchange rate jump.
That is exactly what happened just a few weeks ago, the exchange rate jumped and those with mining hardware saw value added overnight!
Now, no, they aren't worth jack. That's why they are selling for less and less every day. Noobs are what keep the price high, not what set the price.