The value of CNC equipment is far more than just the assembled parts and software. What has been the most valuable part of my investment in Probotix CNCs for both myself and the university I work at is the support. I've lost track of how many times the owner of that company has personally helped me get back in business when either a small limit switch or a $700 controller has failed. All at no cost to me beyond an email or phone call. BTW, I know of no CNC that will not have some sort of breakdown over its lifetime.
We have an industrial grade Multicam CNC ($90,000 new) that has required service vi$it$ roughly every 2 months to get it running again when some system of its complex design failed. The grace of a CNC made from commonly available extrusions, bearings, switches, etc., is that you can easily amend or repair them yourself.
4D.