This. Certain disreputable companies in my sector are recruiting staff from competitors just for their contact list.
The takeaway I feel here is that if you are considering working at an enterprise-focused company (or especially startup), try to get a feeling for how well connected the leadership is, because that will make or break a lot of deals.
The most successful companies I've worked for have no contacts and sell directly. The most politics-filled and most likely to fail enterprise products have always been sold via the "old boys networks".