What do "5 hour energy ads" and many buyer agent ads have in common"

Much advertising by so called 'buyer' agents is no better than a "5 hour energy" drink ad I saw yesterday.  The ad makes the following statements:

1. they sent a survey to 3000  doctors.

2.of those responding 73% would recommend a low calorie  energy supplement to  patients that used them.

There may be nothing false there but I asked the person I was with what they thought the ad said.  They thought the ad said that 73% of 3000 doctors said they would recommend "5 hour energy".  In fact, the ad doesn't claim that ANY doctors recommended "5 hour energy".  The deception is intentional. 

Most people will not notice that the ad said 73% 'of those responding" without telling how many responded.  They don't say what the questions was anyway. And, it says they would recommend a low calorie energy supplement to patients that used energy supplements- NOT that they would recommend "5 hours energy".

I make the connection with buyer agent advertising because the deception in both cases is one of omission and it is intentional.

In the case of buyer agents it often consists of advertising buyer agent services without disclosing that those services may not even be available - as in the case where the agent works for a company that also represents sellers. 

--rant over for now --