Living in a highrise condo downtown, my limitation on N+1 isn't money, it's space. My GF & I get two spaces in our building's bike room where our two hybrids live. And then my road bike and folder live in our condo. My GF won't allow any more than that.

Which I suppose is just as well considering 3 bikes is a decent commuting stable. (but I still want a fat bike)