I have been composing for ... eh, probably 6 years now. I've written some things for piano, haven't played any in recital yet, and I've written plenty enough for large ensemble. I've gotten one performance by a concert band, but that was when I was musically young, so I didn't have the control I have now.
I recently wrote a piece for a competition here on YC, and it was based off a German text so I put the appropriate markings in German to fit the theme of the piece. I went to the Shoutbox to ask if anybody knew what a certain indication was in German and QC asked me, "Why? Who are you writing it for? Who is performing it?"
... and the answer is no one. I would like to get the opportunity to perform one of my large ensemble pieces but those opportunities pretty much never come along. From what QC said, he makes me think that we should write for somebody or some ensemble and it has to be performed or else there is no point to composing it. I'm not saying that is what he is saying, but that is the impression I got. I get this impression from a lot of people, so I thought I'd ask... why do we bother? Do we HAVE to always write with somebody in mind and write specifically for them (the ensemble)? Must we always be queuing up our compositions for performances and tailoring them to the confines of what ensembles we have available to perform them? What is the point in composing if we aren't planning a performance?
Those seem to be the questions I wanna throw out at people when they say, "Well, who are you writing it for?" I'm writing it for my own damned enjoyment. I'm writing to let my creativity flow. I ALWAYS compose and prepare the orchestration and score such that it would be 100% plausible to perform, but I often write difficult figures, or use "extreme" registers. It's like a puzzle to me. Fitting things together in the most pleasing fashion and most playable fashion (if challenging or not.) I'm just trying to get the experience I need to do the job for real and so I have something to show when I want to apply for a school. Is a performance really THAT important? I don't think so. Do you think so? If you do, when do you think it starts to become important in a composer's career? Why do YOU compose? What are YOU trying to get out of it?
When I write something today I write it in mind that if I run across an opportunity to perform it five years from now that I'll have a few pieces I can pull out of the bag from earlier. I'm not vying for a performance immediately, but eventually would be nice. That's to answer one of the questions myself.
(P.S. Incidental composers who compose exclusively for computers... you're void of this.

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(P.P.S. However I know some of you still compose works intended more for performance as well.)