Salespeople need to possess effective trust-based sales communications skills so that they:

Hey there!

For salespeople, its all about relationships and conversations and relationships with people. If you're good friends with someone from your consuming company, you can expect to make good sales as they are acquaintances and would want to buy things from people who they can trust.

Therefore, if you can develop friendships and trust with people from the company who would buy from you, they might just accidentally or purposely let you in on secrets from their company that would maximize sales- and that's always the goal of a salesperson.

Hope this helps!