For me, after taste comes immediate well-being. I feel much better when eating my own home-cooked meals from a range of ingredients on hand.
I also like the feeling of carrying on tradition when I make a very healthy olive-oil based and meat-free meal, or from the other side of my family, the occasional sour-cream and chicken concoction that is just so good I only need one piece.
There's probably a number of other reasons, like being generous to my friends w/home cooked meals, the enjoyment and relaxation I get from shopping and preparing food, etc.
And of course, there's the satisfaction from knowing I will probably be able to avoid most diet-related illnesses given the way I eat. Yesterday I had lunch at the hospital Wendy's on campus, ironic location given the prevalence of obesity related illnesses, which makes me feel that chowhounding can adopt a much more serious role.