Music isn't about becoming the next big thing, and everyone worshipping todays biggest band.
It's as much as an artform as dancing, painting, and poetry.
Actually, poetry is a good thing to compare music to, as music is in itself, poetry with intruments.
Let's say your local misanthrope makes a poem, and he recites it at the local coffee joint. Some snap, some don't. Some connect with it, some are lost.
Some take it as a grandmother dying, some see it as a guy taking a dump in the street.
The poet doesn't care what kind of reaction he gets (although thats not to say that he doesn't appreciate a standing ovation), as the whole point of the poem was to express himself.
That following week, he practices and progresses in his artform and goes back in to recite at Milky's next week.
Music works the same way, it's a way to express your self and challenge your artistic abilities.
As for the music consumer, everyone liking the same band would be boring, as it would probably turn into one big fanboyism mush.
Instead, they find the occasional band thats makes their brow twitch. Thats not to say they should go on every forum on the web yelling how much they suck. Instead, they should consider that band a challenge, and find things they like about it, and discuss with friends. Find opinions, things you never noticed, lyrics you didn't get before, and talent you overlooked.
Thats what I think, anyway.