re: Hubble DVD
There were no major breakthroughs done by Hubble. Exoplanets were discovered by independant teams unrelated to the HST.
It's because the teams who were allowed to use the HST had to present their project years in advance and it was peer reviewed and any out-of-the-ordinary project was going to be suspect.
The thing the HST had like no other scientific project, was a huge PR, lots of money to share pictures with as many as possible, access to media not normally linked to science.
Raoul