It’s definitely never a great situation when money from a creative effort goes to the business in charge of releasing it instead of the individuals responsible for the creation in the first place.
Right now, all kinds of Spinal Tap material is available for purchase, as you can not only buy actual soundtracks featuring music from the group, but also classic accouterments like band T-shirts.
And considering the original claim said that the four creators made $81 off merchandising between 1984 and 2006, it really doesn’t sound like they are getting what they are owed.
Apparently the people who actually created the whole thing (Harry Shearer, Christopher Guest, Michael McKean, and Rob Reiner are not only credited in the film for writing the script, but also the songs).