Random pick our guess does not make us win neither does carefully selected games gives us winning, to me analysing games and matches draws us more closer to winning and the chances are very high than randomly picking. Although someone can be actually correct by picking randomly but the chance are very slime in my opinion, so the best is to give time and carefully make their analysis even as we often say that gambling is a game of probability but there are more chance of winning a well predicted matches than randomly picked.
Although I don't know the correlation between gamble with or without analyzing the match to forecast the result, but random picking is terrible idea. I can't imagine what's the fun with that, when you don't have any idea why you choose that.
Example there's a match Liverpool vs Manchester City, I randomly pick under 2.5 goals. I will be happy if I won, but before and during watching the match, there's no fun at all.