Yea, I think there are 2 reasons ppl don't cook for themselves.

1. They can't. I know someone who even do badly at cooking instant noodle. Can you imagine that? Yea, I can, I taste it, and its hardly edible. I dunno how she make it, but it seriously, waste of food to let her cook.

2. They lazy. As u said, even if we can cook, at least properly (instant noodle, rice, egg, you name it), we won't do it if we don't feel like doing it, and have someone do it instead.

Just beware with a girl/woman who says they can't cook. You MUST believe them. (experience is the best teacher after all...)