Grilling requires not only fire and ingredients, but also space.
Patios and decks are little islands that offer a bit of respite from everyday hectic life. When a grill is added, that little island can become a paradise. One major drawback, however--like many vacation spots--is that they can quickly become overcrowded. Adding a grill only complicates matters; patio furniture in all its forms is sure to follow. And that doesn't even get to the decorative items. But for some, that's a start.