I have both large fowl and bantums - I love the banties because they eat less, poop smaller, brood like crazy, great moms and their eggs make bite-size deviled eggs.
In passing I told a friend I was now selling my Silkie eggs as hatching eggs to make some $$ and she was really bummed that she wouldn't be getting any more banty eggs because they make the perfect deviled egg.
One thing I really love is when you're working with a recipe that calls for 1 egg, but you want to cut the recipe in 1/2 - well how on earth do you 1/2 an egg? Well, now that I have banties, I just use one of their eggs
So, I like the versatility!
OR... 2 large scrambled eggs are too many to fit between 2 pieces of toast, but 1 large egg is not enough for my toast - 3 banty eggs are perfect! The kids love the itty bitty eggs, too.
OR... when your large fowl are laying smallish pullet eggs and your recipe calls for large eggs...add a banty egg to make up for smallish eggs.
On the other hand - when your recipe calls for 4 large eggs and you have to crack open 8 banty eggs - well, that can be a pain.
All in all - I love my banties - a lot of personality on a little bird.