Why is there no soundtrack with the original 80s tracks?
It was not possible based on the initial limited release of the film and the expensive requirements for licensing to release a soundtrack with these songs. But… … A 2 CD soundtrack has appeared for sale in the UK (released on 4th October 2004) and subsequently on import for other countries which contains both the original soundtrack CD and a large number of tracks (but not all) from both the original and Director’s Cut. Follow the previous link for a complete track listing. Note of course that there is still the original soundtrack for sale with the original tracks by Michael Andrews, and the rearrangement of Mad World sung by Gary Jules.