Fun for the kids. (Simple way to get the kids happily involved in a low-tech, low-cost activity.)
It keeps the house cooler in the summer.
It's cheaper than going out to eat--by a lot.
It teaches the kids a useful skill for future camping fun; or perhaps, God forbid, survival.
It's potentially healthier than many other meal choices.
It creates more family-time opportunities.
Time spent outdoors is something we all enjoy.
Here is a link to how to make a cooking style campfire, and some easy recipes to enjoy outside, or in your fireplace.
Enjoy the season.