Most definitely, sometimes you can't have all the knowledge regarding a game and that half knowledge will make your decision wrong and there will be chances of you losing the bet. Will be joining group tomorrow. Thank you for the service.
Even if you are an expect you cannot win all the time,if it was that easy then we could see more millionaires who made money just by gambling. 
It is all about knowledge about the sport and keen interest about the current events of the team and the form of the players are all important when considering a bet.