guys its not a conspiracy, they change the price according to the value of the coin.
if the crypto the coin mined decreased in value or there was a drastic mining difficulty jumps, the cost of the unit is ajusted to compensate.
This.
Except for the initial $800 offering, that was based on the assumption ETH would fork. When they announced they wouldn't, the price basically tripled (2.5ish, really, but still).