My findings on using machine learning for sports betting: Do bookmakers always win?

One afternoon, in the middle of my holidays the thought of using machine learning to predict football results in the premier leagues came to my mind. I have never bet on sports myself because I do not like to dispose of the money, I make that way. However, I entertained the idea. I thought that if I can design an algorithm that gives me over 60% accuracy, I could spread the risk and bet on multiple matches, thus making constant revenue. I thought the following, if I start with £100 (I live in the UK), and bet £10 pounds in 10 different matches, the odds are that I could win around 5 out of 10 matches.