¿Cuál es el valor de las máquinas de Bitcoin?

Could you please elaborate on the value of Bitcoin mining machines? I understand that these machines are used to generate new Bitcoins through a process known as mining, but I'm curious about the financial implications and how the value of these machines is determined. Specifically, are they priced based on their hashing power, energy efficiency, or other factors? Additionally, how does the value of Bitcoin itself affect the value of these mining machines? I'm eager to learn more about this topic and appreciate your insights.