Breadboards are great, dont get me wrong.
What im saying is the whole point of a dev board is to not have to wire the basics like caps, resistors, icsp and possibly usb.
if you have a base sytem to work with it saves time and possible headache. Imagine wiring a lcd or led matrix on a breadboard and its not working... weeks later you find out a cap for the osc is missing or a power strip wasnt connected.. its a problem solved with a dev board
also reuse is a plus!