I have twenty-one currently and a broody hen with eight eggs under her. I also have two turkeys.
I use them for eggs, really, but they're also just fun to have around. The eggs are just a perk.
I have way more than I really should because I free range them and there's always a chance for some losses, unfortunately. I also like watching how they interact with each other and warn each other of predators. Safety in numbers is something I considered too.
I have a white leghorn, two cochins, a buff orpington, a silver laced wyandotte, a golden laced wyandotte, two ISA browns, a rhode island red, a black sex link, a dixie rainbow, a barred rock, a random black breed, and three easter eggers. I have five chicks I hatched a week or so ago as well. My silver laced cochin is their father (and the father of all the ones my broody is sitting on) and the mothers are my barred rock, an easter egger, a black jersey giant that I recently lost, and my buff orpington.