It takes a lot of time to sculpt things, especially when they are as nicely done as what Matt does. Resin, even in bulk, is not uber cheap. Casting all of these, and especially the painting process would be a lot of work for each set too I imagine. Then there are the brackets that need to be fitted and created.
Sometimes it's easy to look at the toys your kids have and wonder why pinball mods have to be so expensive, but when you consider the much smaller niche run, and the better quality, anyone that has tinkered in any of this stuff knows how much time and money actually does go into these things.
How much is the TZ piano? How much for a custom shooter rod? How much for all those other stationary mods you have bought? If you fit into this category, you might now imagine now why a 5 piece custom set off walls may not be cranked out at $50.
I recently considered trying to make a mod which I think would look great, but after figuring out all the costs involved just to cast and mold the damn thing, the time to sculpt and do other stuff, and the likely pricey tag I would assume would be accepted - seemed like exercise in frustration for me.
If I had this machine (one day I will I'm sure), given the upgrade value in appearance, I would not hesitate to buy.