How much money does it cost you to create that node?
Can I use my PC (CORE i7) to do this, or do I need a specialized hardware device?

I read on one of the forums that I can make returns from $ 10 to $ 30 a month?
If this is true and I can manage 3 nodes without having to sit in front of the computer for a long time, then perhaps it is considered a good source of income in some countries where there is electricity and equipment.