I condemn such people, but I understand where they come from. In many sports, a negligible number of players make more or less normal profits. Do you agree that it is quite difficult to spend all your youth on one sport and realize that you will not be a top player and your efforts will not pay off? I think disappointed such people are trying to make money.
But that is still not a good excuse, you choose that sport, you should love and respect it, when you cheat you are cheating the fans of the sport and I don't think that's acceptable.
Let's put it this way, a certain league like NBA is very successful because the fans are supporting it, watching the game and buying their stuff that's why the organization were able to pay their players with lucrative salary, but if one player will rig a game and it was discovered, that's a shame for the entire organization and bad image for the NBA and possible other sports will be affected.