I agree! This would be ideal. Providing a collection of apps as a bundle for a specific niche, with users paying a monthly fee to access the bundle.

Example 1: DJ Music App Bundle Collection (8 apps for $20/mo)

Example 2: Artist/Songwriter App Bundle Collection (10 apps for $20/mo)

Example 3: Music Manager App Bundle Collection (5 apps for $10/mo)

One monthly fee gives the user access to all apps in the collection.