I bought a lot of originals, in fact when I sold my A500 I fished out all the boxed originals and was surprised to see just how much I had, stacked together they built about a 1m cube! Some games like; Frontier-Elite2 you had to have the manual for.
Of course I also had 100's of copies aquired from adverts in the paper. You'd go around to someones house and pick out a stack from his collection, pay about 50cents a disk. Irresistable towards the end of the Amigas life when retail outlets stopped stocking Amiga software.
People are right about actually playing the copies, at some point it stops being about enjoying the software and more like collecting for the sake of it, because you can.
I used to really savour my originals, a good game like Myth or Frontier could keep me going for weeks. On the flip side, paying $50 for a crap game stung so bad it'd almost justify getting copies to try b4 U buy.