If You Ever Need Anything, I Might Give It To You

Does anybody ever say that? Does anybody ever say, "Hey, if you ever need anything, I'll quickly evaluate your situation and judge you, and then decide if I should, in fact, give to you what you desire?"
No, nobody says that. They say, "If you ever need anything, here's my number/give me a shout-out."
But why say it if you don't really mean it?
Is it just something that you say to fill a gap in conversation that holds no real relevance to the holder?
Usually, it is said to somebody who has endured some difficult hardship or is about to. The people who these things are said to are often people in undesirable circumstances, who are in a state of emotion distress or trauma, and do hang on to the things that are said, remembering them in their time of need.
But, at the actual time of need, the speaker of these words is held accountable and should thusly be prepared to act on them. No excuses should be barred, and no lies committed, leaving both parties mutually satisfied: the one helped, as he/she desired, and the other helping, as he/she desired at some time.

Or is that not what you wanted after all?

This just goes to show that it's not actually how you say it, it's what you say.
If you don't intend to keep your word when saying something nice, then don't say it at all.