The other consideration is the "excessive celebration" yellow card. Players who score in a big game have to concerned with celebrating too much or they'll get booked.
While bench players entering the field and getting sent off is a concern, I'm more concerned with the bench players riling up the goal scorer and the referee misunderstanding a lot of people yelling and screaming for the goal scorer "excessively celebrating" or taunting when they are simply excited about scoring a big goal in a big game. Also, if the referee thinks the bench is excessively celebrating, the coach may get booked. Some schools and/or school districts fine coaches who get booked or sent off.
