Ok, so when you buy a machine, you actually buy the machine that works closer to what the ideal machine should work for you. You get in this case all those components: 3 motors, slides, excenters. Most likely after combining all this stuff, you come up with the ideal machine. What are you going to do with the remaining stuff that most likely you'll never use again just because it's not good enough for you? If you need a liner or another same setup, you buy another system, and get another 2/3 stuff you'll never use.