Fleece your friends and neighbors for money? I know someone that owns a Police Force that has a switch inside the machine to add credits. Now I know the silliness of this, as you could do the same thing by hitting the coin mechanism. You still have to open the cabinet. 
Quoted from RobT:What is a "credit" button?
It's a button that allows you to add credits to the game without putting in any quarters. It's seems like the kind of thing that would only make sense in a home environment, but I don't understand why it's necessary on a game that can be set to free play.
Probably the same people that use quarters. They probably like to hear the credit up sound bytes. I manually credit from time to time to hear them on my machines. I have even considered going to coins for the full arcade vibe.
Quoted from HOOKED:Newbie - lazy - battery acid damage (not keeping memory)
That would be my educated guess. It's not keeping memory, and on power-up it goes to factory settings; which require you to drop a quarter.....
Or they did not do their research and look for the option in setup. On my DE SW, it was buried and a little hard to find.
The black knight I just bought has one installed too. I don't know why as it can be set for free Play
perhaps ignorance? Finding things in used pins that doesn't make sense to an educated enthusiast / technician is nothing new!
Wanna join the discussion? Please sign in to reply to this topic.
Great to see you're enjoying Pinside! Did you know Pinside is able to run without any 3rd-party banners or ads, thanks to the support from our visitors? Please consider a donation to Pinside and get anext to your username to show for it! Or better yet, subscribe to Pinside+!
This page was printed from https://pinside.com/pinball/forum/topic/why-would-someone-install-a-credit-button-a-game-that-can-be-set-to-free-play and we tried optimising it for printing. Some page elements may have been deliberately hidden.
Scan the QR code on the left to jump to the URL this document was printed from.
Plainfield, IL