It isn't? I certainly doubt whether it's true (not being in enterprise sales myself and not being important enough to end up on the other side of those sales) enough to make a cliche (I don't doubt somewhere somebody invited a client to golf to make a sale - but how common is it?) and haven't seen any reliable sources on the prevalence of it.
It's a big fat cliche. For instance, here's how Tony Rodoni (Executive Vice President for the Commercial Business Unit at Salesforce.com) starts a blog post of some sort:
"When I started in sales, my boss told me, "Your job is to get to know your customer and build a relationship. Nothing is more important than building a relationship.” The second most important thing was to make sure that the customer always won when we played golf."
