I think 8 inches is probably more like 1-2% at least than just 0.1%.
I'm guessing it's like height. There's a lot of guys around 6'1" or 6'2", but only about 0.5% are taller than 6'4". Still, I see men that tall and taller around all the time.
Think of it like this, even if a NBP 8 incher is 1% of all guys you really shouldn't be concerned about a lot of women having slept with somebody that size. If you take a thousand guys, that means ten of them have a penis that big. If a woman is sleeping with a sample of the population, even a big one, say 50 or so, the odds that she'll hit one of the 8's isn't great.
Also consider that even though there are these ten 8 inchers in there, they would have to be a compatible sexual partner with the woman, actually attract her and then sleep with her, and also be available. Basically what I'm saying is that you can rule some of those guys out by circumstance.
I'm not picking on anybody's lady's honesty or anything, but like that poll in the other thread? Yeah right. It doesn't work statistically that all those women are experiencing men that size unless they're sleeping with hundreds of men.
As far as the really big ones go, I look at it like this. There probably are quite a few. I'm just going to guess that a 10" penis is about as common as a 6'10" guy. Once you get into that range it's pretty rare, but at a rate of 0.01, there are still quite a few of them in an average city. But spread out through the population, attractive enough to pick up women in the first place, on the market, ect., well, the odds that a woman has ever slept with a man that size are low. Real low.
Even if 10" was the 0.1% the odds are still really really low (again, unless she's sleeping with men by the hundred). And if you actually did meet a woman who had, the odds that you'd meet two are pretty bad. 7" is probably not terribly uncommon, not the norm either. Remember, most women don't read Penis Enlargement forums or spend much time in their lives analyzing penis measurement, so I think most of the time 7" is 8" or 9" in woman land.
In all the things I've seen on the internet where women talk about penis size (and there have probably been too many since I became interested in this stuff), the women seem to always refer to an ex that was "huge, like 9." I think it's just a thing women say, as if it was a right of passage they're left out if they haven't slept with a massive guy. It doesn't mean much, and I wouldn't let it bother you no matter how many times you see it.
If you get up around 8" you're packin' bigtime, any woman would think so.