Well that might be part of the plan. If someone sounds intelligent people are more likely to smell that if they push an issue they have someone on the phone that can do something. If you're talking to an idiot you are stopped dead in your tracks.
Along those lines sometimes I have to answer the phones with customer service calls. What I've found is that if I sound like a robot (very staccato) people are way less likely to bother me with other issues. If I sound intelligent and knowledgeable they are very likely to pepper me with extra questions that fall out of the realm of what we actually do. And waste more time. (Not discussing the merits of whether it pays to go "the extra mile" or not. Just highlighting people's behavior.)