"If you are not an AROS developer, and not involved in its promotion or hype, what use is AROS to you? Why should you really care about AROS?"
The short answer is: you should't. And the best thing is, no one is asking you to!
The long answer is: anyone can "develop" AROS, be it by means of contributing directly to its codebase, or by developing applications for it, or by giving suggestions, or by drawing icons, writing documentation, or whatever else suits
your needs. As for the "hype" and "promotion": has it ever crossed your mind that it's not AROS devs who hype it or promote it? Have you looked at how many people are subscribed to aros-exec?
Like it or not, AROS represents, to some people, something "good", something to "promote" and something to work on their spare time.
Anyone is free to contribute to AROS, and AROS itself is the summation of all those contributions, hence AROS is what people want it to be.
What do
you want AROS to be?