Yes, you are right, but what about buying the new bikes and getting it robbed, from the SBB velo parking lots? I think in the city like Zürich Bike-stealing is a common case and also unresolved.
If you are using your bikes and expecting to park it at SBB velo parking lots, my strong recommendation is buy an old one worth 50 to 120 CHF....and don't get upset when its stolen. just buy another old one and expect it to be stolen in another year or two.

what say?