I like to use it to teach/learn.
I've posted some pretty experimental stuff, mainly to show I did something some users didn't know RB could do. For instance Odd Time generating of Realtracks. A couple forum members and I (looking at you Oren and tommyc) have had a blast in the past playing with such things.
In the posted song list 'Count Me Out' is one such piece. Wild is another (though it is listed as Back in the Day).

I've also learned from what some others here have done.

It's all good.
If I do ask for comments I usually try to reference what I am asking for specifically. Example: is bass to heavy? .. does this sound like a 'rock mix' . or at least reference what I was trying to accomplish to give anyone who cares to comment an idea of what I am asking about.
Example2: I was going for a live feel/sound.Does this work?

I think it helps others realize what it is I am after. I may not care if you like the song or agree with its sentiments. Sometimes I work on things because someone else asked me or it got voted on by committee (and I lost), etc.
I may agree that the story line stinks or the 'screamo' vocals are annoying, but may want input on another aspect.

Asking the right questions can have great affect on the resulting answers.

I do not work here, but the benefits are still awesome
Make your sound your own!