Missing a player should only be with their importance and the position they are holding also matter for them to be missed because most player if they are a barrier to the team or are not making any progress changing them will never be a problem to their entire fans or fellow players in the same club but when they hold so much value and importancy and high stakes in the team when they are being assigned to another club there is always a remark that will come from the fans for changing them to the other club however they would also miss their good time with their previous club.
When we miss a player who is the best player on the team then I think about the possibility of winning. If the possibility of the winner is lower than losing then I take part in the opposition to reduce the lose. And if the chance of being a winner is more than to be a loser than I stop placing any new bet.
Yes you are right, that has to be looked at as well because most time when the winning probability is low then there is no need to bet because already we can change bet, but when the winning is high or how often he do gives the team a regular goals it makes it more attractive for the fan to keep missing that particular player. But when the player doesn't play well or doesn't make progress on the club the fans won't miss him or the entire club can also rejoice for leave of such player.