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Betting without research means you are gambling blindly.
It is most important to do research before placing a bet on any game or sport, because the more you enter the gamble blindly, the more likely you are to lose. Because a blind person always enters based on guesswork, just like in betting, but when you research a match and determine the difference between the two teams, your chances of winning will immediately be higher.
Because only the lucky ones win, but if a gambler enters the gamble based on proper research and experience and courage, the chances of winning the bet are highest.
Actually, luck and experience are equally important to win in sports betting. A gambler cannot win by relying entirely on luck, "again" he will do a lot of research and place bets, but if luck is not with him, the game will change at the last minute, and gambler will lose. Here, luck is 50% and experience is 50%, that is, a combination of both can win a gambler.
I'm happy you labelled it sports betting, otherwise, luck would have had almost 100% as the determinant of the winning. Sure, in sports betting, luck is important but expertise is more important. This is why I do not even agree with the 50% you attributed to luck in sports betting, it may be more or less depending on the expertise of the gambler. Luck shouldn't claim a high percentage if the gambler is good in his prediction and management. Everything about gambling in sports has its right scope, and if we adhere to it, we can win more.