I have a mill and lathe and have found most people will not pay the costs to make machined items.
Been there done that already, still make custom parts for the people that really want it.
They want it for the cost of very cheap labor, like almost free. I was charging $20/hr + costs and that made most kring.
Been making parts since I was in grade school (60's). My dad was a millwright machinist by trade.