I used to have "favorite numbers" for the lottery we have here in Brazil. I realized this was limiting me and ended up changing. Nowadays, I choose the numbers when I get to the place where the bets are being taken. Sometimes I go with the bet already prepared, with the numbers already decided. I stopped betting on the same set of numbers a long time ago. Imagine, you decide to make a different bet and the result is the numbers you bet on before? I think I would go crazy...