Quoted from fosaisu:
Oops, sounds like I had the wrong idea about what powder coating should cost. I thought I read somewhere that markmon gets his done for ~ $150 per game so I was expecting something more in that range!
It is possible to get the job done cheaper, but you're looking at the difference between Stern's nearly painted armor as opposed JJP's multi-stage powder coating application that gives depth, texture, and gloss. It's the difference between getting your car painted at Maaco or a custom hot rod shop, and $100 on a $4k+ game is typically less than the cost of LEDs, toppers and mods... with a bigger impact.
Here are some examples of the multi-stage applications:
I've got a game I'd like to get done as well, but ideally want a shop that knows how to do pinball parts properly.