Every professional trader in any field is the one who has the source of his livelihood, that field means the job he earns. This makes it his own business. A professional trader is someone who practices no other profession than trading, so it is his sole source of income. If Broker is doing side work in the field of trading, such as managing accounts or providing paid signals, or he is part of a site that is providing education in trading, we consider him a professional trader.