It's a collectors item, why do people by anything old? Yeah, I can't do anything serious on the Amiga, but who cares? Just load up a game or two and relax, it's a hobby. Once you accept that Amiga isn't coming back as a serious contender you can just revel in the fun computer "antiquing."
The iMac puts food on the table (earns me a living), edits my pictures and video, the Amiga is really a "boys toy," something to play with in my spare time. They (the Amiga and the Mac) serve different needs live together quite happily...
