what's the meaning of "for ten points" in the sentence?

The question is addressed to a private in the (US) Army. He's jokingly being treated as a contestant on a game show, and the answer should be obvious to a private in the Army.

Thank you very much. By the way, do you have any idea about the song "kiss me goodnight sergeant major"? Is it an American song, or a British one?

Exactly, Rog. And what you're implying, without saying directly, is that it's ONLY 10 points.

The way these game shows usually work, the "ten-point" questions would be the easiest ones. The more difficult questions might be worth 20 points, 50 points, 100 points, etc. The more difficult the question posed is deemed to be, the more points you are awarded for getting the correct answer. Maybe Yellhue already knows all that, I dunno.

I don't think she knew the game show context. Not everybody watches the stupid things.

I don't either, but I get the idea of how they work from SNL skits like this:

http://www.traditionalmusic.co.uk/1940s-top-songs/kiss-me-goodnight,-sergeant-major.htm

How did Wales, Scotland, and Northern Ireland manage, I wonder? And are WW2, the Battle of Britain, and the Blitz separate things?

When I was 10 my uncle taught me an obscene version (what he called the "real version") of "The Long and the Short and the Tall". He said "Don't sing it to your mother".