I agree with you point that fans protesting at a home will be have a very negative effect on the players and manager and could even result in defeat because of it. (justarsenal.com)
It's definitely a good thing, as in moderation gambling can have a lot of positive effects on its players. (avillafan.com)
They found that simple messages, displayed during load screens, can have a big effect on player behaviour in the subsequent game. (newscientist.com)