Has anyone NOT listened to their system for a long time?

Yes, when I worked at the record industry.

Yes, when it gets too cold in the basement and when I choose to listen to new music on the PC - YouTube (T-amp/13vPSU, Wharfedale Diamonds.) Or when I watch music DVDs of live gigs on my projector rig. (EICO HF35 tube monobloc amps, Spendor SP2/2 speakers.)

For the last year I guess I turned my system on nearly a dozen times - sad but true. The reason is I'm living in a small apartment and I have a one year old baby. The living room, where the audio system is, is the place where the baby (and everyone else) spends most of the time. There is no chance of listening to music on a proper way. Anyway, we have plans to move to a bigger house where I can have my own space - my man cave!
In the meanwhile, I've been upgrading the system and buying music as an investment for my near future. And I've been listening to new music a lot more through my headphones on my way to work (Radio Paradise is my companion along the rides).

I like the distinction "music-o-philes vs equipment-o-philes".  Yes, I have been caught listening due to an improvement in sound, but this also gets me interested in my music collection again, which can become somewhat stale over time---until a breakthrough in sound quality re-engages me in new depth and enjoyment.  There is no end to improving a good system with small changes.  

I often turn on the (tube) equipment to warm it up, then don't get around to listening.  Have to be in the mood.