It's the same reason why companies buy licensed software even when decent open source alternatives exist--they know they can pick up a phone and yell at someone

It's the same reason why companies buy licensed software even when decent open source alternatives exist--they know they can pick up a phone and yell at someone when something goes wrong. Also, there is a ton of folklore built up around the market and telling your golf buddies you are with 'so and so' is just another kind of name dropping.