Cheating has grown over time and is becoming more prevelant essentially because the penalties are not harsh enough to stop the hardcore cheat no matter what guys and by example they draw others (especially those that are young in the sport) into the same kind of behaviour.....
as for coaching from the sideline types those can be fun...year before last i played in the memphis indoor and it had sideline coaching, and while it does suck to have people telling the other guy you are about to mug him on the other hand it's pretty funny, while standing on the side, to tell them the the other guy isn't posted on him when he really is...."oops my bad i meant he IS looking out the right side" so after a while no one listened to anybody anyway