6. Ignore personal bias
Most people who bet on sports enjoy watching the games that they love as well as like to see the teams and players perform well, which can influence their choices.
Although it's not a major issue when it comes to backing your favorite team, but it's important to avoid allowing personal biases to affect your decisions in gambling, for example, the team you support is playing against another team, and you are very sure that that other team is going to win the game because they have a very much stronger and well coordinated players than your favorite team.
Of all your points I have a hard time following this one, it's like a part of me is betraying my favorite team or player and you always wish that your team or player can and will upset the opposing team, I experience losing in the past, that is why I prefer not to bet when my favorite team or player is against a very tough opponent and I have a small chance betting on my favorite team or player, I prefer this than betraying my favorite team or player.