> It worth a upvote (though my upvote carry no rewards).

I appreciate every upvote, especially when they come along with a thoughtful comment like yours here. Rewards are what ever, chatting with people is more fun anyway.

> By the way, why in this earth the researchers had the idea to do research on such topics!!

Because some people (physicians) won't believe they are susceptible to the biases with out data to back it up.

> Obviously, I have seen some doctors or teachers who are using MR (medical representative) of various pharmaceutical company shamelessly. 

Yup. 

> I know a good number of doctors who also do the same.

I am sure most doctors have a strong moral code and do that, however others just don't see the issue. Research like this just might convince them. Or perhaps it will convince the general public to get mad enough to try to institute policies making sure this isn't allowed. 

Some Pharma companies are always going to try to sweeten the deal for doctors with regards to their drugs, making this as difficult as possible will result in more consistent care for people over all IMO.