In that era (when I spent some time in the music industry) it was common for labels to tell artists to not release 12 "Good" tracks. It was more like 3-4 Good tracks and then basically Filler tracks/B-side quality. But if you wanted the Good tracks, you had to buy the whole CD, and you might listen to the Good tracks 30 times, but the Fillers a lesser amount.

This makes the per-track payment extrapolation from CDs somewhat challenging as these days users have more control over specific tracks, and artists can also do a track-only release as easily as a full album release if they want.