A strong, fit man decides that instead of grabbing the absolute closest and most convenient parking spot to his destination, he will leave it and park further away, in case someone more infirm/encumbered (not disabled - different topic) than him comes along.
As far as I know, there is no halachic obligation to do this, but doing so seems to be the bread and butter of being a decent thoughtful person. You'll also only find one person in a thousand who would do such a thing.
What does the Torah say about such a person? Is it bittul zman, or is he just being silly, because there's no halachic issue? Is it fine, but nothing special? Is it considered a small or even great act of loving kindness even if 99 times in 100 someone just as fit as him (or nobody at all) ends up grabbing the spot anyway?
Is there a guiding principle that can help us here? Does this case translate to all walks of life? Are there sources that praise a person who doesn't run to always be the first in a line? Who doesn't always claim every legal/tax benefit he is entitled to if he doesn't need it? Who waits at a kiddush to let everyone else get what they want and then see if there is anything left for him? Not as a matter of personal growth and perishut, but in the context of chesed. [Let's leave out extreme examples that involve distracting factors such as pikuach nefesh etc]