Excellent quality for the price
Japanese business hotels are intended for businesspeople on business trips. Most people in Japan when on business are riding the trains, so the hotels are generally located right outside the station.
For about an average of 5,000 yen for one person per night, you can get a decent room, and often times a buffet style breakfast will be included. Places with no breakfast can get down to the 3,000 yen range, but they're often much more bare bones.
On another note, each floor of the business hotel will likely have vending machines with instant ramen, alcohol and soft drinks so you don't have to go wandering around a town you are unfamiliar with. Although this can be part of the appeal for some, like myself.