ROSS: Monica, if you want, I can lend you some money.
MONICA: No no no, if I couldn't pay you back right away then I'd feel
guilty and tense every time I saw you.
ROSS: Oh OK. Well then why don't you, uhh, why don't you borrow it
from mom and dad? You feel guilty and tense around them already. You
might as well make some money off of them.
CHANDLER: Ya know, the man's got a point.
I have two questions:
For the sentence make some money off of them, why did it add a preposition of? It's weird to me. I'm more familiar with make some money off them, because off already has a meaning of "from someone", which don't need an extra word of to emphasize again.
From the dictionary, I found that get a point means score a point, which is absolutely used in some competitions or quizzes. Is it a humorous way to say what the man said makes sense, or is it just a common expression to convey the agreement with someone?
Off of is often used in place of the preposition off in contexts such as she picked it up off of the floor (compared with she picked it up off the floor ). Although off of is recorded from the 16th century (it was used by Shakespeare) and is logically parallel to the standard out of, it is regarded as incorrect in standard modern English.
Now, about the point
someone got a point - someone got an idea to think upon