When someone asks for help concerning what might be the best speaker out of lets say 4 reputable brands and 20 people reply with other speakers, none of which the poster had asked for.
When someone says speaker B is better than speaker A....from what they heard, or a buddy told them.
When someone ask for help and their budget is $2000 and people suggest speakers that are way over budget for the poster.
When someone suggests only their own brand as they believe it is the best possible speaker over all the rest.
When you have done your research and know what you want and a salesperson tries to talk you into something else.