I shower and wash my hair every other day, sometimes every day. My skin is pretty sensitive and I have eczema, so I can't overexpose it to products in the shower or it dries out and gets worse. My hair is a bugger as well, being both really long and really fine, it takes a lot of care to keep it in good health, so washing it every single day tends to fuck it up.
To put it another way I'm a dermatologist's nightmare and a stylist's dream.