Opinion

An "opinion" may or may not have value.  Is one less or more "valuable" from an individual who's "trusted" than from a "stranger"? 

Let's use a "self-endorsement" to illustrate:

• An individual or "consumer" has or hasn't used some product or "supplement".
• They are or aren't compensated or paid to state "it worked for them" or they "feel better than 'before'".
• Does a "conflict of interest" exist?

Another way of asking that is:

• "Can they be 'trusted'"?

So... are "commercials" or "advertisements" made backward?