「褒めても何も出ないよ」「褒めても何も出さないよ」


I think this is what people commonly say:

> 褒めても何も出ないよ

But I feel iffy about the switch of subject here. 褒めても of course talks about
the listener. Why does the subject switch to an inanimate thing in 何も出ない? It
is no surprise that て形 connected sentences have multiple implied subjects
(e.g. お金を貸してくださって、助かりました), but why not something like this with the speaker as
the subject of the second clause:

> 褒めても何も出さないよ

Google seems to indicate this is indeed something people say
([example](https://www.pixiv.net/novel/show.php?id=4117163)), but not as
commonly. Another option that crossed my mind is subject conformity:

> 褒めてもらっても何も出さないよ

It sounds weird no end and doesn't appear idiomatic at all. Why do people use
the first version? Why 出る? Why is it necessary to give an unspecified object
agency?




I think you'd be assigning too much importance to subject agreement between
connected clauses as a grammatical phenomenon if it crossed your mind even for
a second. You are free to pick whatever subject you think is fit according to
what makes pragmatic sense and your preference. So the subject agreement in
「褒めてもらっても何も出さないよ」 does not make it preferable to the other two in terms of
grammar, and it's just wordier without an apparent merit.

「褒めても何も出ないよ」 is a highly idiomaticized expression, so people use it without
thinking about its literal sense, but I understand your feeling that the
speaker's using 「何も出ない」, thus effacing their own agency in the situation, is
somewhat unexpected. It sounds as if they were talking about some mechanism
(an inanimate thing, hence better compatibility with 「何も出ない」) that
automatically gave out something in response to a certain stimulus. I think it
wouldn't be too far-fetched to imagine that the prototypical utterance of this
phrase was a jocular metaphor where the speaker was comparing themself to
something like a vending machine (it could be anything, or nothing specific --
just a vague allusion to some kind of non-human quid-pro-quo mechanism), where
you put your money in and it gives you a goodie in return.

On the practical usage front, there's some difference in nuance between
「褒めても何も出ないよ」 and 「褒めても何も出さないよ」. The former goes like "You won't get you
anything flattering me, you know.", and the latter like "I won't give you
anything even if you flatter me, you know.".

I'm not entirely sure if the translations make things clearer, but my main
point is that 「褒めても何も出ないよ」 sounds more non-personal and humorous, while
「褒めても何も出さないよ」 possibly might sound a tad bit more like a refusal, like the
speaker thought the flatterer were really trying to get something out of them.
That maybe partly why the former is preferred.




何も出ない{わよ/ぞ/よ} is a common humorous response to blatant flattery, and it can
work even without saying 褒めても (or おだてても) explicitly. It sounds like "I know
you flattered me, but thanks anyway".

So I think the main answer to your question is simply "set phrases and idioms
are often idiosyncratic". Still, maybe one can argue that 何も出ない would sound
better as a joking response since 何も出さない may sound a little too direct and
harsh.

