Anyone knows if this any good? Internet say this can make up to $15k a year using this.
At 5 cents for electricity, you can earn 25 thousand dollars, but this is only a possible profit, which depends on various factors, such as the price of the coin and the number of ASICs in mining.
https://www.asicminervalue.com/miners/bitmain/antminer-ks3-9-4thA payback of 7 months looks very tempting.