Do you pay attention to ingredients in cat food before buying?

Ok I ask this because of posts I read on here. Do people pay attention to the ingredients in cat food before buying or do they just buy it because they see it on tv and pay no attention to ingredients. Here are the first 7 ingredients in Purina Cat Chow dry:Poultry by-product meal, corn meal, ground whole wheat, corn gluten meal, soy flourWhat is poultry by products anyways, and look at all those grains why do carnivores need all those grains. Here is the first 7 ingredients in one brand of Fancy Feast canned: This is the turkey and giblets kindMeat by-products, meat broth, poultry, poultry by-products, natural and artificial flavors, guar gumYuck Yuck yuck by products and no named meats. Here are 2 much better foods:TimberWolf Organics Serengeti: (dry) Chicken Meal, Fresh Chicken, Chicken Fat (preserved with mixed tocopherols), Low Ash Salmon Meal, Potatoes, Tuna Oil (preserved with mixed tocopherols) Dried Eggs, Dried Chicken LiverNow that looks better look at that (cont.