Like you, I prefer this strategy because I enjoy following the matches I bet on. Perhaps this is the healthiest thing about gambling, meaning that gambling games remain linked only to sports matches. All other forms lead to disastrous results in cases of addiction. Gambling companies are not subject to any restrictions in game designs. Personally, I consider slot games and all online games to be a real waste of time, and I am surprised by this great demand for them.
It has pros and cons.
When you bet on a match you are watching/ following, you are likely enjoying the match and every situation in the match. In entertainment aspect, it is good for you to have fun and refresh your mind.
But it is not only good, if you are a type of person who can be affected by emotion, you will make more extra bet during the match. By emotionally bet more, you are taking more risk with more emotional bets. It will potentially lead you to more inaccurate bet decisions.
Well you should not bet if you can't watch the game you are betting on since you will just get easily affected once the result will show not in favor to you. But if you are into fun factor and just add up some bet just to make all things exciting while watching then I guess this is really a good option since it could spice up the speculating experience since there's a bet at risk. Also once you and your friends are their watching together this negative feeling will be eliminated and for sure the fun factor will be there then they might forget about discouraging feeling on the losses they get. If they really want to win and want to avoid those inaccurate betting decision then they must research first before placing so that they could see on which of them have better chance to win.