When we are gambling and considering playing games like sport bets, then we should not expect luck here, because everything comes as a result on how we are able to know about football and then play our way round about the match in place, same also applies on the gambler who wishes to play slots, which he should have already have a preset mind that its all about luck, a newbie or any other gambler interested may try his luck in playing this and win, this is not about our desperation, anxiety or even calmness towards playing a game, but the way we understand how each game should be played.
Why should we not expect luck from sport bets? Because it's skill based does not mean that success in your bets only comes from skills, though you have an edge by knowing your way around the games but with the way gambling/betting works, if you are too confident in some bets, which will cause you or the bettor to stake with a huge amount and when they lose the bet, it can cause stress, anxiety and regrets which is not good for a gambler.