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No. They wouldn't live in a barn that way. They are monogamous, so should be kept in pairs. I suppose in a large area -- like a BIG aviary, with lots of hiding spaces, you could safely have more than one pair.
However, a barn simply wouldn't be secure enough. These are tiny little birds, easily killed and eaten by any predator imaginable. They have zero defense except to popcorn up and try to fly to get out of danger. Plus, they cannot tolerate cold temperatures. I've read that 45 is the ULTRA lowest they should be kept. I won't be going ANYWHERE near that low with mine. (The heater in their room will be set to 68-70 all winter. I'll just have to cringe when I pay the bill.)
You can eat the eggs that they lay. It takes a while to crack them, but we do eat them. I refuse to waste those little eggs! It takes about 20-30 to make a fried egg sandwich.