OT: Why do people use double negatives and add confusion?

"Half price or better" makes sense, we know "better" means "even cheaper than half price".

But my "at least half price" - so it could be more than half price?

It's perfect English, I'll add a comma to see if it helps you:

Judging by the prices, they meant half or more removed from the price.

Kind of like asking "Are you mine?" vs...

"Is You Is Or Is You Ain't My Baby?"

Covered by many. Cab Calloway did a great job...

That's the pluperfect tense. Perfectly straightforward.

Don't tell me you didn't listen during Latin lessons?

The plu what? "He had to go out" means the same thing.

Only those with OCD care about such a tiny difference.

The pluperfect. You can always Google it.

Tell you what...

Here you are:

"He had had to go out" and "he had to go out" do not mean the same thing and they never have. Even the Romans knew that.

No, complaining about a stupid thing people do is not OCD.

You need to if you don't have OCD, as it doesn't come naturally to normal people what the meaning of "it's not unusual" is.

Subtlety is for OCD folk.

Only if they see me do it.

If you don't have a clear number, you can be vague and say "more".

I only have one brain, unless you count the gut, which some biologists do.

If you need precision, you need numbers not words. What's wrong with "rare", "quite rare", "fairly common", "common"?

OCD folk like to think they have superior brains, when in actual fact they overthink everything and can't skip over unimportant stuff.

What if they're on the phone?