believe is primarily attributable to our new pricing introduced in 2023 and the promotion of value-added services. In addition, we sold 30 salons to third-party investors in 2023 under the sale-and-outsource business model.
The primary reason for the decrease in revenues from franchising was a decrease in the number of franchised salons. As of December 31, 2023, the number of franchised salons decreased to 96 from 113 salons as of December 31, 2022, due to our acquisitions of franchised salons and franchisees’ withdrawal from the business.
Our initial franchise fees and expected renewal franchise fees are recognized as revenue ratably over the expected average franchising contract life (seven -10 years) on the opening date of the new franchised salons. In addition, our revenue from franchise royalties includes revenues from recurring royalty income, rental income from subleased salon properties, construction of franchised salons, uniforms and training sales.
Revenue from our Digital Preventative Healthcare Segment decreased by JPY185,986 thousand (US$1,156 thousand) from JPY386,384 thousand (US$2,402 thousand) in 2022 to JPY200,397 thousand (US$1,246 thousand) in 2023. This decrease was primarily due to delay in the development of our REMONY® system and MOTHER Gateway device, with which corporate customers can benefit from our SDK open policy and monitor health conditions of a large number of MOTHER Bracelet® users, partially offset with an increase in the number of participants in the Health Guidance Program and launch of Lav® app services.
Revenue from our Luxury Beauty Segment was JPY567,695 thousand (US$3,529 thousand) in 2023, a decrease from JPY594,761 thousand (US$3,697 thousand) in 2022. The primary reason for this decrease was that ZACC’s total number of customers served decreased from 41,548 in 2022 to 36,883 in 2023. This decrease was primarily due to the resignation of one our top stylists in February 2023. Since most of our customers designate their stylists, once a stylist who has a strong network of customers resigns from a salon, the salon loses most of such stylists’ customers. In addition to the stylist’s resignation, our number of stylists at ZACC salons decreased from 29 at the end of 2022 to 26 at the end of 2023. Such a decrease in the number of stylists reduced our capacity to serve customers and to maintain our customer base. In order to recover the lost customer base, we made an effort to foster assistants and promote them to stylists more quickly. Nevertheless, we could not fully replace the number of lost customers with increase in customers who designate existing stylists or newly designate the newly promoted stylists. On the other hand, our revenue per customer at ZACC salons increased from JPY14,307 (US$89) in 2022 to JPY15,331 (US$95) in 2023.
We are still in the process of improving the current situation by hiring additional talented assistants who we believe have the potential to be top stylists, and training existing stylists to better promote themselves via social networking services such as Instagram.
As a result of the foregoing, our total revenues were JPY6,827,943 thousand (US$42,441 thousand) in the year ended December 31, 2023 as compared to JPY6,954,057 thousand (US$43,225 thousand) in the year ended December 31, 2022.
Cost of Revenues
For the year ended December 31, 2023 and 2022, the cost of revenues was JPY5,259,075 thousand (US$32,691 thousand) and JPY5,051,600 thousand (US$31,400 thousand), respectively. The increase was primarily due to an increase in the cost of operation of salons outsourced from investors corresponding to an increased number of investor-owned salons, an increase in payroll of our salon staff and an increase in outsourcing costs of contract-based therapists, partially offset by decreased cost of franchising due to a decrease in the number of franchisees and decreased unit costs of the MOTHER Bracelet® due to a decrease in the number of MOTHER Bracelet® units sold. The cost of revenues as a percentage of total revenues was 77.0% during the year ended December 31, 2023 and 72.6% during the year ended December 31, 2022.
The cost of revenue from directly-operated salons increased by JPY452,190 thousand (US$2,811 thousand) from JPY4,129,240 thousand (US$25,667 thousand) in the year ended December 31, 2022 to JPY4,552,408 thousand (US$28,297 thousand) in the year ended December 31, 2023. The cost of revenue from franchising activities decreased by JPY122,403 thousand (US$761 thousand) from JPY645,733 thousand (US$4,014 thousand) in the year ended December 31, 2022 to JPY523,330 thousand (US$3,253 thousand) in the year ended December 31, 2023.
Selling, General, and Administration Expenses
For the years ended December 31, 2023 and 2022, the selling, general, and administration expenses were JPY1,960,447 thousand (US$12,186 thousand) and JPY1,805,490 thousand (US$11,223 thousand), respectively. Selling, general, and administration expenses