Yamamoto Koji, the producer of Noitamina, apologized to the staff for the low rating of Saraiya Goyou in his twitter. According to his post, the rating of the episode 1 was 1.5%, which was considerably low compared to other Noitamina series (eg. Nodame Cantabile Finale: 3.9%, Tokyo Magnitude 8.0: 5.8%, Higashi no Eden: 4.8%, Moyashimon: 5.2%).

Generally, rating of an anime program aired after midnight doesn't matter to its producer since the business model mostly relies on the DVD sales. However, keeping high rating is crucial for Noitamina to maintain the timeslot because they aim to attract the general viewers, who rarely purchase anime DVDs

Sources: Yamamoto's tweet, Mainichi, Web Anime Style
related topic: Noitamina Suffers From the Discrepancy between Rating and DVD Sales