Buy to own!
 

Remember some of these games have copy protection schemes so you need the original discs. I know a few games I have even DOS games use copy protection that needs the original disc. Some of these games are hard to copy and some games use special designed disc. So keep your original disc since it could contain special tracks that you can't reproduce! The moral of the story... if you put the time and money out to own it you get special materials not available elsewhere.