For the Kaspa coin, there is already a new ASIC Bitmain Antminer KS7, which has a hashrate that is 2 times higher and consumes slightly less electricity. It is very risky to buy an old model if electricity is expensive. When new models start mining en masse, the profit on old ones will decrease by 2-3 times. With my 5 cents, this ASIC Antminer KS5 gives a profit of 4 dollars per day, and it will be 1.3-2 dollars, which is not so interesting.

For the Kaspa coin, there is already a new ASIC Bitmain Antminer KS7, which has a hashrate that is 2 times higher and consumes slightly less electricity. It is very risky to buy an old model if electricity is expensive.