Being a professional can mean having a source of income that is more stable and abundant. However, unwanted events can happen, which can lead one to lose more money than he can earn. This is usually when he makes a mistake, a possibility that can happen anytime. As the clich goes, nobody is perfect and even well trained professionals can be prone to errors and omissions. Sadly, such mistakes can be very costly, sometimes draining even what one has in the bank.