Final answer:
The text attributes the frequent productions of Golden Age musicals primarily to their entertainment value, which includes music, dance, and theatrical spectacle.
Step-by-step explanation:
According to the text, a primary reason for frequent productions of the Golden Age musicals is their entertainment value. The text emphasizes how the incorporation of music into storytelling, enhanced by the production numbers, makes musical theatre a highly popular art form. It highlights that while musicals serve various functions, including cultural and historical significance, it is their ability to entertain audiences through performance, music, dance, and spectacle that largely contributes to their persistent production and appreciation in contemporary times.