Pompiere

As long as the SO is still complaining about why you need a second bike or third bike, etc., you have to persevere and get another one. When you get to the point where she says "Why do you need all these bikes!, you are golden. That's because she is no longer counting and they are just a grouping. You are now free to add and remove from the group at will. She will still be annoyed by their presence, but unless you start infringing on her living space, she won't notice the individual bikes coming and going. They are just "all those bikes".