Shoes that don’t fit (and free salt)
A beautiful pair of shoes, but one size too small, on sale and everything…. Not worth buying, not for you, not at any price. Because shoes that don't fit aren't a bargain.
And at a restaurant, you may have noticed that there's no extra charge for salt. You can have as much salt as you want on your food, for free. (Of course, it's not really free, it's part of the cost of the meal, so we paid for it, so we might as well get our money's worth, might as well use a lot.) Of course, that's silly, because regardless of how much we were billed for the salt, no matter how unlimited our access to it is, using more is merely going to ruin our meal. Too much salt isn't a bargain.
Buffets (like life, organizations, projects, art…) aren't actually, "all you can eat." They're, "all you care to eat." Which is something else entirely. Just because you can have it doesn't mean you want it. Just because we paid for it doesn't mean we should use all of it.