Double yolk eggs... ever seen one? How about 12??

Have you ever cracked an egg and found a double yolk?  Well I have once or twice before, but its rare.  So how rare is this????  I bought a dozen grade A large eggs from Publix and found out that EVERY SINGLE ONE of the dozen had  two yolks inside.  I swear, this is true.  

Do you think this is a major bonus, or kinda gross???