I use my "old" (if you can call it that way) Amiga, becuase i grew up with that machine, it gave me good fun over the last years, and it still does.
Of course I am not only using my Amiga, but i hafta say that to 80% it is my Amiga that i use most. Therefore my Amiga lives for ever, no matter what happens.
I use it because i want to use it, because i like, because it is a wonderful piece of technology!!!!!!