I keep a few of mine in the loft. It is because I have no room in the house and I can't think of getting rid. Up there at the moment we have:
1. Gazelle TT bike with twin discs (diff sizes) and back killing frame, (1980s) with full Mavic group.
2. Mike Kowall fixed.
3. Alan with classic Campagnolo and Suntour Superbe Pro.
4. Dawes Edge frame set.
5. Steve Potts Cross Country Racer frame that has ever been built up.
They don't seem to come to any harm. I need to take the wheels off and remove saddle and post. I also have a tall, strong and forgiving wife!