whoever boasts about his earning (generally speaking not only bitcoin trading related) is always lying. because you will never find someone who is advertising their financial situation to others if there is no benefit in it for them.
in case of traders, only those idiots who think if another newbie idiot falls for their nonsense and buys bitcoin they can make profit and if they don't they will lose everything!
Definitely true, everyone has an agenda, whether its as simple as a need for positive (or even negative) attention, or its just a ploy to make them look smarter or exploit people thinking they are knowledgeable for some other angle.