I sell mine for half the cost of the standards and it works out faily well.
They cook up the same as the regular eggs. I think the true conversion is that 3 banty eggs equals two standard eggs, but I generally just use one banty egg as half of a regular egg. Most of my cooking is not that...
I sell my banty eggs as well. I just had a guy buy a dozen to make deviled eggs for a party. They are bite sized!
It takes a little more marketing. I point out that due to their high yolk to white content they are perfect for omelets. They do make really sweet hardboiled eggs.