Its very simple
When dealing with video games you are just dealing with the Video game company. There are special rules applied to video games scored in LA. They are produced with "buy outs" meaning no royalties (or Union fees) are due to the players if an album is released
The MOH scores are also recent recordings that need little to no transfers done. The cost of transferring the elements for the 4 Lethal Weapon projects alone (with the multiple elements and formats we had to work with) could have bought us a very nice car.
With the LW scores, we also had to make deals with not only Warner Bros Pictures, but with the WEA, the record company that owned the soundtrack rights to the first 3 films. So, the cost of producing these 4 soundtrack releases jump considerably when dealing with TWO companies.
Speaking of the original soundtrack, deals were made years ago to include the very high profile artists that had songs on the original soundtracks -- guys like Sting, Beach Boys, George Harrison and Eric Clapton. Those deals must be honored.
Speaking of Eric Clapton...he, Michael Kamen and David Sanborn are credited as composers on these films. As the more films were made, the higher the royalties got.
And then there are costs for images, cd manufacturing, paper, boxes, etc...
In all honesty, this set should be $150.

Hope that makes sense
MV