Why wierd?
In my case, it's because I only have a flat, with no shed, and no bike store. So I have no choice. The daily use hack lives in the lobby downstairs, the other two in the flat itself - and I change which is daily use according to the season. My trike lives in a shared lock-up, across town, so that would hardly be convenient for my daily use bike, would it? Seeing as I need the bike to get to the lock up...
Many houses don't have enough back yard for a shed, or like my sister's place the garden is only accessed though the house - so if there's room, why not keep the bike indoors, if it has to come through the house anyway?
Plus, it's more secure than out in a shed. And handy if you like to do a lot of tinkering.
Only riding when you go home? Wierd! Get a cheap and cheerful hack for god's sake and keep it at the house, uninsured.