i can see collecting guns of historical signifagance. thats like a gunnies version of antiquities. i can even see a well made recreation or commemorative historical piece, as it would be related to the history.
but for movie stuff/celebs, meh... maybe if your the hugest steve mcqueen fan ever...
if you're a big fan, and you like to collect guns (not just acquiring the right tool for the right job), then you betcha.
the right gun for the right job can ecompass a collection (in fact its the main criteria in our house)