Best bang for the byte (not the buck): other than embedded systems (including some phones), no other common "system" does more in less space (and time)!
OK, mostly joking, as that's not the sole reason, however valid it may be. I agree with many of the reasons others (murple: agreed) have given. A few more for me (in no order):
* fantastic games (gameplay, graphics, music, MOOD)
* best demos
* !best! freagging music "library" ever (games & demos)
* out of huge respect for the phenomenal technological leaps that made the computer (hardware & OS) and from amazing people, such as Miner, Haynie, Sassenrath, etc. I will run Amigas as long as I can out of my respect for these people and their creation. The world ought to know, and keeping them alive and working is one way.
* out of hope, the hope that one day the spirit that embodied the creation of the Amiga and its creators, will rise up again (through perhaps new, youthful geniuses) and change the technical/computing world from the uncreative, bloated, short-sighted, contriving and manipulative Microsoft-enslaved cestpool that it is.
Honestly guys, I've *not* had as much fun with a modern computer since those early Amiga days. One exception to this: Macbook from Apple. Got one of those and started playing around with Photobooth (for those that don't know, it's a very *simple* program that takes photos, but words can't describe how much better than any other such software it is - it's all int he details folks...) and my girl. We were laughing and cracking up for an hour!!! Add to that the excitement of opening the "perfect" box, the smell of the plastic, the finesse of everything inside and included. (The only things really missing were the programming manuals with the chip registers, memory map, etc, hahahaha!) Anyawys, I almost cried when the fun feeling of those old days came back out from the dark crevices of my mind!
Computing should be *fun* and most of the world (bar Apple, and that's why they're getting my buck) has forgotten that!
Amiga Forever!!!