Mcmaster also isn't (somewhat famously) competing on price. They won't rip you off, but you can't sort by price. There are no sales. With limited exception, they won't list brands on the site. (But if you contact them, they'll gladly tell you who so you can buy direct.)

Their target market is people who need to fix something quickly or get some industrial supply item tomorrow so work isn't stopped.

Massive corporations save money via the end user by taking a chainsaw to customer service. Large tech companies (and many other industries) will just quietly fuck the regular customer over because they can't profitably do customer service at scale. Even Amazon's effectively no questions asked return policy is a band-aid over the forgeries and trash that fill their hyperscale market.

If you have a problem with an item that Mcmaster sends you, they're going to go have a stern talk with the manufacturer. They sell reliability, not race to the bottom capitalism.

(I've also heard that they really take care of their employees. People in jobs that are automated away are always retrained; they'll pay for college with no qualifications, because education is good even if they don't directly benefit, etc.)