What made you put together your first 2nd system?

I've just fired up my 23rd second system. Or as I like to call it, the laptop.

Basement surround system, shop 5 speaker system, garage 4 speaker system, shed (backyard) 8 speaker system, office 5 speaker system, bedroom 3 speaker system and finally both stereo and surround systems in the A/V room.
31 years in the same place will do that.
No help needed

I had a big series of upgrades, but really liked my little entry level system. Kept the whole Shebang...

Different systems for different purposes - main system for serious listening (usually while reading or working on something) located in large walk-out level recreation/pool table room, outdoor system for the back porch and pool area, and living room system for television/movies and background/dinner music.

You have asked what I would call a "first world question".
I will have to get back to you on this one.