As stated by the law. 90% of everything, including such laws, is crap.

Can’t tell if driest sense of humor ever or worlds most literal person.

Looks like humor to me.

wow, it even works on Hacker News comments!

That's the joke. You just restated the joke.

I'm posting a comment here so that the odds for better comments elsewhere may improve.

I'm the creator of the 1000 skeptics theorem:

You take infinite skeptics, give them all typewriters, poof! All the great works debunked.

I get the humor, but I do feel as if there's some converse to Sturgeon's Law in certain areas, in that for some things, 90% of everything is more than sufficient for most people or situations.

Athletics is maybe a good example. A bunch of caveats aside, most products being marketed to the broadest markets will more than suffice, and expensive alternatives have only marginal actual utility for a miniscule subset of those markets. There have been studies showing, for example, that the actual gains for use of super running shoes are very small in absolute terms, and generally only apply to elite runners; typical runners, even good but not elite runners, may not see any gains, and may even lose time from them. What gains they might have are not going to make a difference to their times in the grand scheme of things. I think similar arguments could be made for a lot of cycling products etc.

Maybe they're different issues but sometimes I feel like Sturgeon's Law applies well, and sometimes the opposite is true.

When I'm buying something in a new category that I don't know much about, I'll go and buy something that's above the bottom tier. Often that's good enough for me, and other times I'll learn there's something lacking and find one that satisfies that. In certain areas I'll simply splurge because I can justify it from the amount of use or value it adds to my enjoyment (audio gear) or work.

I see what you did there :-p