Although I'm not @scutters, i think I can answer that question.
A while back, some dude from the Netherlands wanted to use two plugin instances, so he could have scrolling info on his backglass and show the ticker on his playfield. Even though it was years ago, that quirky Dutch guy is still using both instances.
Edit: found an old post: https://forums.gameex.com/forums/topic/23213-plugin-pinballx-statistics-display/page/4/#findComment-210819