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That's what I figured, though I think questions that get 'sufficient' responses certainly should qualify as posts.

Is clicking the post my answer box a one time thing, because I am not seeing the option?

I think that would be justified but maybe they are worried about abuse. Others have been asking just to post the question. I know you would be genuine but they wouldn't.

Yeah, steem will be better once the community steps up to guard their norms.
Its not hard to spot the abuse, but good luck getting enough downvotes to stop it.
Once we have a rep for not tolerating abuse things will improve.

So, where does the question post to if it doesnt appear on steem's front ends?
And doesnt the ability to post invisible content give an abuse vector?

Yes, that is how I got notified of replies.

If I look on @musing I will see my comments on a post on their blog, genius.

Do y'all take beneficiary rewards?

I just had a look at steemd.com and there is no beneficiary being taken out of questions or answers.

Pretty cool I think, but I imagine that they (musing) will get a nice steady flow of curation rewards.