I remember the halcyon days of the dot com era when hot redheaded sales reps from Exodus would take you on datacenter tours and treat you to dinner to secure a lucrative two-rack deal.
I remember pushy but friendly Oracle salespeople selling you on a $250k six-processor O7 license predicated on "well ebay's using it".
Nowadays I refuse to take vendor phone calls. If I need a solution, I google it or ask around my circle of tech friends.
The claim that sales is "valuable" is lost on me at this point.