Sales amounted to approximately 5 million yen by 1930. The company's market expanded throughout the Kansai region, Kyoto, Kobe and Nara to Osaka, where the private railways and national railways were based, and on to the Kinki region, Sanyo, Sanin, Shikoku and Kyushu.

Dressed in pants, store employees used bicycles to visit pharmacies. The company's best customers generally had small stores, even in large cities. Large stores and chain stores had not yet emerged, and most stores plied their trade from an inconspicuous location, tucked away in the corner of the town.

The stores lacked displays, and their only advertisement consisted of pamphlets pasted with glue onto the shop's glass door. The inside of the store was equipped with cabinets with glass doors and drawers, from which employees would take out a customer's order. As with other products, pharmaceutical products were not yet manufactured and consumed in large quantities. Marketing placed high priority on reliability and results, especially since traditional distribution and consumption methods were deeply rooted, and steadiness was essential. The latecomer Kobayashi Daiyakubo extended its reach in Doshomachi with pride in its good name and respect for its solid foundation.

Kichitaro, who stood at the head of this venture, specifically targeted several leading wholesale businesses, and encouraged his employees to chase after these wholesalers, overtake them, and make Kobayashi the No. 1 company in Japan. It was from this point that Kobayashi employees became renowned for their strong work ethic and solidarity.

While striving to make his company into Japan's top pharmaceutical wholesaler, his main goal was to sell his company's pharmaceutical products. He put so much effort into expanding sales channels for Kobayashi pharmaceutical products that it was said that "you are not a salesman if you don't sell Kobayashi products." Kichitaro did not only give pep talks to employees, but invested large sums of money in advertising that were unprecedented in that time period.

There was no television at this time, and radio had not yet reached its full popularity, so the main medium for advertising was newspapers. Kichitaro proactively placed advertisements in newspapers, and also carried out unique ideas. He held promotional drawings with free gifts, invited customers to sales, actively used pitchmen and sent caravans out to travel around the country. These promotional caravans even traveled to Korea and China, as well as throughout Japan.