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.