Yup, size = more upkeep.
Larger birds = larger food bill
All in all I like the larger breeds better, more meat and larger eggs too, so as long as you pick a good laying or dual purpose breed it all works out.
dual purpose birds are hogs. My marans are total PIGS and also don't lay well unless they have 20% feed. If you just want eggs go for lighter birds that still lay well. Cream legbars don't eat much, for example.