The reason you cannot find games like DUNE II uncracked all over the net is because most prefer having the cracked version. Only a few who like to have original images of a specific game or guys like the WHDload team have a use for them. If they are requested then I can see a point. Otherwise we could all upload copies of all our originals.
See if you can find anything in your collection that is not readily available in either form. Stuff like burseg is sending up.
The James Pond Pre-release is nice. Find more stuff like that.