I'm going to tell you something gross. In our old apartment (thank goodness we moved) the bathroom was connected to the bedroom. It also had poor ventilation, so a lot of steam from the bathroom would linger in the bedroom, making our closet (dun dun DUN) damp...which then led to (dramatic pause)...mold. I know. Really, really gross.
As a result, many of my shoes were sacrificed. I saved my wedding shoes and cleaned them with tea tree oil and left them in the sunlight, but many of my other shoes were just too gross to wear again.
Recently I treated myself to way too many new pairs, which left a dent in my bank account. But on the upside, I'm ready for summer (and vacation!) now. :)