Quoted from KingPinGames:
That is mostly correct. The butter cabinets are done in batches. I'm not sure in the number, but let's say its 10. That means if game number 1, 8, 28, 40, 72, 90, 110, 140, 150, 166 are butter cabinets, then all of those will get done at once. It's also done when the cabinets are ready. If the line is on game 65 and the butter cabinets are ready, then the butter games will get done. If you are number 1 you might be waiting a while, but if you are number 150, then technically you are getting your game early.
Hope that makes sense.
It does and thank you - you gave a more intelligent explanation than I did (don't get a big head or anything, it's not a high hurdle). I know literally nothing about building pinball, but some concepts are shared in manufacturing/assembly operations. Businesses have two options: 1) maintain the ability to perform all functions under roof or 2) rely on subcontractors and/or vendors to improve efficiency and reduce overall cost. If the business opts for #1, everyone chips in via higher pricing and if #2 is in play and a buyer insists on a specific departure time based on serial #, that would be a separate negotiation and most often price the game well beyond practicality.