I don't know why but I've seen more of those than I can count. Maybe it's the cheapest switch people can find at a hardware store or something. Usually I see it on older pins.
The only way this could be "neat" is if that door bell opened the coin door automatically. Poor poor Blackout. The funniest part of it all is that the game can be put into free play!
i found an old delta queen pinball machine that i pulled outta someones basement......not a collectible machine but it was $50 and worked with a old style doorbell atached to it