I agree 100%.
This is a second function lathe. It is powered by 60 year old electronics and there are no parts. The vintage electronics uses vacuum tubes.
Check out Keith Rucker of Vintage Machinery.org fame. He has a 10EE he is converting to modern electronics. Keith has not said what this is costing him, but, I am sure the first $5000 has left his account.
A Monarch 10EE is a beautiful lathe, when it works.
We don't have 10EE's in the UK (well I have never seen or heard of one being here, despite the fact the later ones the casting was done in the UK), but I believe a good one makes are very desirable lathe and the original drive electronics when functioning properly make the machine great to operate. A bad one being a complete and utter nightmare.
They were very expensive machines intended for industry that could afford to run and maintain them, they're probably not the best choice for a general purpose lathe in a home shop.
I believe there are parts for the drive systems, depending on exactly which version it is, they just are very expensive.