Well technically you're burning the same number of calories regardless of the time of day they were consumed, and two meals per day is a lot easier to keep at 2000 calories (as a rule of thumb - different for everybody) than three meals per day.

Personally I like to keep the digestive process dormant for as long as possible. Eating breakfast makes me hungrier throughout the day, so I end up snacking more than I otherwise would. I've never been a breakfast eater though so I'm pretty well wired not to break fast until lunch.

Edit: also heavy foods require rest and digestion that I do not have time for most mornings