Do you know that boiled eggs can be a healthy supplement to your cat's diet. Just don't forget not to give them too often, 1 egg once or twice a week is pretty enough. Given more often boiled eggs can cause some problems.
Raw eggs are not good for cats (like for us) because they can be source of Salmonellosis. If they are cooked, there is no harm. Recently there was recall for some pet vitamins because of Salmonellosis so don't consider that giving a pet food all the time will be safe enough. Of course there are some premium pet food with responsible manufacturers to rely on. I have my favorite brand cat food but I think that the best cat diet must include both home made and commercial cat food.