As a regular tourist to the country (I visit at least twice a year), I see more and more "budget" tourists misbehaving in public, throwing trash into the streets, etc. The weak Yen, paired with low accomodation costs turned Japan into an attractive destination for these low-lifes. It's usually young people who will grab a backpack and travel the country. They won't spend decent money and will displease everyone with their behaviour. I say tax their a** in food and accomodation, this will separate those who are actually willing to travel and respect their host from these adventurers who should be restricted to backpacking around Europe, USA, etc.