A theory I heard is that Japan has a fixed idea of what things should cost, and if anything ever costs more or less, there needs to be a good reason. Using price as a market signal is culturally unacceptable. Conveyer belt sushi still costs ¥100 for the cheap stuff, and ¥200 for the higher-end shops. Even things that are overpriced have remained overpriced for the last 30 years. Video games have always cost ¥7800 yen, about twice as much as in the US, and music CDs cost ¥3000, again about twice as much. And don't even get started on what it costs to own a copy of a TV show.
Once the culture has decided what a price should be, it can never go up or down. If you change the MSRP, it's a sign that you're trying to cheat people. Either the customer, if you're raising prices, or the business community, if you try to lower them and undercut competitors.