A few pages back, someone asked why their enjoyment of family history should be regarded as an 'obsession', whilst their OH's collection of travel books was described as a 'passion'.
My husband and I had a similar discussion only yesterday, when he asked why I was 'obsessed with dead people'. Ignoring the, 'never answer a question with a question' advice, I asked him why he always felt the need to buy far more wood than he required when doing anything. His reply was - a rather unsatisfactory - 'just because ...'
QED I think?