If Felder in the US are anything like Felder here, the $6,399 "price" is only the start. Every little nut or screw extra = more money. It became a pretty pricey machine by the time I had it where I wanted it.
I think a lot of the extra price in ATC's comes from the spindle itself - they're significantly more expensive than non-ATC - easily double. Adding the pneumatics and isn't too costly in terms of equipment, but it adds a fair bit to build time.
Marius is turning his machine into a fantastic little beast.