Sacrificing For Your Kids...Not Always Common Sense

As you  may know by now, my husband and I have four children.  The first three are very close in age, within three years of each other; and the last is almost five years younger than the third.
When the kids were pretty young, probably about 4, 6 and 7, we took them to a church-organized carnival.  You know, with games and little prizes that they can win.  I believe it may have been the ending to the Vacation Bible School for the year, or some such thing.
Anyway, the place was really crowded and, for some reason, we had a limited amount of time to spend.  When we arrived and saw the lines for the different games, we took the kids aside and explained to them that they would need to look around, figure out which games they really wanted to play, and prioritize them, as we definitely would not be able to get to all of them.  After a quick trip around the gym they decided on a game (they all chose the same one to start), and we stood in line.  The gym was hot, and very noisy.  There were kids running all over and, I'm sure, everything seemed very exciting to our little ones. After several minutes, we were edging closer to the activity in front of us and, pretty soon, the kids turned their attention to the game that they would be playing in just a few more minutes.
There was a woman standing in front of us.  Neither Bob (my husband) nor I had paid much attention, until she started yelling across the room.  We took our attention from our kids and turned to look at her.  To our amazement, she was yelling to her children, who were playing another game on the other side of the room.  When the kids heard their mom yelling, they finished up their game and came to walk right up to play the game....the game that their MOTHER had stood in line for THEM to PLAY!  We were speechless.
I believe that it is never too early to teach your children that there are sacrifices to be made when it comes to getting what you want in this world.  Every other child in that room had to make a decision regarding what game they were going to play, and what would be sacrificed, due to time constraints.  No one else was allowed to use someone else to obtain everything that they wanted.  What a lesson that mother was teaching her children.  "Here kids, go live it up.  I'll sacrifice for you.  I'll do anything for you so that you can have everything that you want.  You don't have to wait in line.  You don't have to take turns, like everyone else does."  Aren't you just asking for your kids to turn out to be selfish, spoiled brats?  Life would be pretty empty if all we ever did was strive for getting everything that we want, no matter the cost.
Rest assured our kids have grown up hearing this story, and the lessons to be learned from it, many times.  Isn't it just plain Common Sense?