Convince me it's a bad idea

To just but a 2 group second hand machine. Once you get into the 3k range for another grand on top you can buy a refurbished 2 group. Yes it will be 230v, yes it will need a plumbed water line...but is there something else I'm missing. We are heavy home users, typically 4 to 6 shots in the morning for the house and on weekends when we have family or friends over I'm running 12 to 16 shots through a barista express. I am assuming a commercial machine from a major manufacturer will have parts support, be serviceable, etc. Anyone own a commercial machine for home use?