Question for you 'big iron' collectors

I've been following the list for about a year and a half now and I'm curious -- you guys (both genders) that have the room and the know-how to run the big stuff -- what do you do with them? I guess I'm not that familiar with non-business apps for minis and I'm just curious what someone using a PDP at home would do with it? Do you just write code for the sheer challenge of writing code? Have you written real-world apps? Is it just nostalgia? Or do you keep them running purely for historical reasons and don't have any practical day-to-day use for them? It just fascinates me that there are so many of you who run these beasts and I'd just like to know why. Thanks. Paul Braun NerdWare -- The History of the PC and the Nerds who brought it to you. nerdware(a)laidbak.com www.laidbak.com/nerdware