You say you are all for bitcoin, but see no reason why people would spend bitcoins instead of dollars, or why they would use a bitcoin atm/kiosk. Maybe they want to buy bitcoins and don't have a bank account to use with an exchange site, or don't have internet access or know how to use mtgox. Maybe they want to buy something online with bitcoin they can't get locally with dollars. Maybe they are migrant workers and need to send money back home to their country. Maybe they obtained some cash they want to save but would prefer not to deposit at a bank. I can think of many reasons for bitcoin kiosks, I love this idea.
Or to pay workers (over the $600 limit), migrants or otherwise, so there's less paperwork for the IRS (the kind folks there deserve a break, too).
Or at a flea market.
Or at any large event where pickpockets are known to lurk.
Bitcoin: Easy to Get--Hard to Take